History

unpublished changes since 12.4.0

Feat: implement an interactive version of the Lorenz example, and show the chart full screen (#3151). Thanks @dvd101x.
Fix #3163: toTex wrongly returning Infinity for large BigNumbers.
Fix #3162: add license information about CSParse (#3164).
Fix: faster startup time of the CLI and REPL by loading the bundle.

2024-02-22, 12.4.0

Feat: implement support for trailing commas in matrices (#3154, #2968). Thanks @dvd101x.
Feat: improve the performance of multiply a lot by adding matrix type inferencing (#3149). Thanks @RandomGamingDev.
Fix: #3100 function round not handling round-off errors (#3136). Thanks @BrianFugate.
Fix: PartitionedMap and ObjectWrappingMap missing a property Symbol.iterator, causing problems when trying new Map(scope) (#3156).
Fix: type definitions of function mode (#3153). Thanks @rich-martinez.
Docs: describe method getAllAsMap in the Parser docs (#3158, #3157). Thanks @dvd101x.

2024-02-08, 12.3.2

Improved the performance of custom defined functions in the expression parser (#3150).
Fix: #3143 cannot use and and or inside a function definition. Regression since v12.1.0 (#3150).

2024-02-01, 12.3.1

Improved the typings of the arguments of ArrayNode, FunctionNode, IndexNode, OperatorNode, and RelationalNode (#3123). Thanks @sylee957.
Added a fully featured code editor example with CodeMirror and Katex (#3027). Thanks @dvd101x.
Fix: #3114 build warnings related to a number of wrong /* #__PURE__ */ annotations.
Fix: #3142 support BigNumber values for the options of function format: precision, wordSize, lowerExp, upperExp. Support BigNumber values for the option wordSize in the functions hex, bin, and oct.
Fix: #3125 type definitions of function hypot (#3144). Thanks @silentmissile.
Fix: #3141 help(config) altering the actual config when evaluating the examples.
Docs: #3145 fix documentation about REPL, it does require a build step nowadays.

2024-01-12, 12.3.0

Implement support new metric prefixes: ronna (R), quetta (Q), ronto (r), and quecto (q) (#3113, #3112). Thanks @AlexEdgcomb.
Fix a bug converting a unitless unit (#3117). Thanks @costerwi.
Fix: #3097 toSI() wrongly converting degC (#3118). Thanks @costerwi.

2023-12-20, 12.2.1

Fix #3109: method Node.toHTML not accepting a custom handler.

2023-12-08, 12.2.0

Feat: lazy evaluation of operators and, or, &, | (#3090, #3101, #2766). Thanks @smith120bh.
Fix: passing a 4th argument with a scope to raw functions.
Fix: #3096 embedded docs of eigs throwing an error.

2023-11-17, 12.1.0

Feat: Extend function round with support for units (#2761, #3095).
Feat: Extend function mod with support for negative divisors in when using BigNumber or Fraction (#3087).
Fix: #3092 a typo in an error message when converting a string into a number.
Fix: #3094 function derivative mutates the input expression when it fails.

2023-10-26, 12.0.0

Breaking changes:

Fix #2879, #2927, #3014: change the confusing interface of eigs (#3037), thanks @gwhitney. Before, functions eigs returned an object:
```
{ values: MathCollection; vectors: MathCollection }
```
where vectors was a 2d matrix of which the columns contained the vectors. This is changed to eigs returning an object:
```
{ 
  values: MathCollection
  eigenvectors: Array<{
    value: number | BigNumber
    vector: MathCollection
  }>
}
```
Where eigenvectors is an array containing an object with the corresponding eigenvalue and vector.
Refactored the TypeScript type definitions to make them work with a NodeNext module resolution (#3079, #2919).
- Type MathJsStatic is renamed to MathJsInstance.
- Type FactoryDependencies is deprecated, use MathJsFactory instead, and import dependency maps directly from the library.
Change the assignment operator of .toTex() output from := to = (see #2980, #2987).
Drop official support for Node.js 14 and 16.

Features:

Function eigs now has an option to turn off calculation of eigenvectors (#3057, #2180). Thanks @gwhitney.

Fixes:

Find eigenvectors of defective matrices (#3037). Thanks @gwhitney.

2023-10-26, 11.12.0

Implemented function subtractScalar (#3081, #2643), thanks @vrushaket.
Fix #3073: function format not escaping control characters and double quotes (#3082).
Fix: function clone not throwing an error when passing an unsupported type like a function.
Fix: #2960 add type definition of function symbolicEqual (#3035), thanks @juancodeaudio.

2023-10-11, 11.11.2

Fix #3025: improve handling of matrices and error handling in function corr (#3030). Thanks @vrushaket.
Fix #3074: improve error message when using function max in derivative.
Fix #3073: fix parsing quotes inside a string.
Fix #2027: cannot use named operators like to or mod as property name.

2023-09-20, 11.11.1

Fix #2989: use one-based indices in print in the parser (#3009). Thanks @dvd101x.
Fix #2936: mod sometimes giving wrong results due to internal round-off errors (#3011). Thanks @praisennamonu1.
Internal refactor of quantileSeq, and fixed the embedded help (#3003). Thanks @dvd101x.
Updated dependencies and devDependencies.

2023-09-05, 11.11.0

Implement function corr to calculate the correlation between two matrices (#3015, #2624). Thanks @vrushaket.
Lock fraction.js at version 4.3.4 for now, see #3024, 3022, rawify/Fraction.js#68.

2023-08-31, 11.10.1

Upgrade to fraction.js@4.3.4, see #3022.
Fix #3020: lruQueue using the global hasOwnProperty which may be polluted.
Add support for prefixes for the unit erg, and restrict prefixes of the unit joule to only long prefixes like kilo and no short prefixes like k (#3019). Thanks @costerwi.
Add a new browser example examples/browser/lorenz.html that uses solveODE and plots the result in a chart (#3018). Thanks @dvd101x.

2023-08-23, 11.10.0

Extend function quantileSeq with support for a dimension (#3002). Thanks @dvd101x.
Implement #2735: Support indexing with an array of booleans, for example a[[true, false, true]] and a[a > 2] (#2994). Thanks @dvd101x.
Implement function zeta (#2950, #2975, #2904). Thanks @Bobingstern.
Fix #2990: DenseMatrix can mutate input arrays (#2991).

2023-07-24, 11.9.1

Fix a security vulnerability in FunctionNode and SymbolNode allowing arbitrary code execution via math.evaluate. Thanks Harry Chen.
Fix #3001: mathjs bundle containing new Function(...) (CSP issue).

2023-07-19, 11.9.0

Implement function solveODE (#2958). Thanks @dvd101x.
Implement functions zpk2tf and freqz (#2988, #2969). Thanks @alykhaled.
Implement support for units in function range (#2997). Thanks @dvd101x.
Fix #2974: simplify puts plus and minus signs next to each other (#2981). Thanks @MaybePixem.
Fix #2973: fixes and improvements in the embedded docs (#2976). Thanks @dvd101x.
Fix #2996: two errors in the examples in the documentation about Expression trees.
Fix round-off errors near zero when converting temperatures (#2962). Thanks @costerwi.
Refactored function range, reducing the amount of code (#2995). Thanks @dvd101x.

2023-06-20, 11.8.2

Fix #2971: improve typings of statistics functions min, max, mean, median, mode, std, sum, prod, variance. Fixes a regression introduced in v11.8.1.
Fix #2972: type definitions of Unit.divide(Unit) have a wrong return type.

2023-06-13, 11.8.1

Fix #2964: issue in function distance when calculate the distance from a point to a line (#2965). Thanks @Kiku-CN.
Fix math.format not working correctly for engineering notation when using BigNumbers and for fixed notation with precision: 0 configured (#2956). Thanks @mgreminger.
Fix #2880: not possible to map cube root cbrt.
Fix #2938: make the syntax description of all functions consistent in the docs (#2941). Thanks @dvd101x.
Fix #2954: improve the TypeScript definitions the return type of functions min and max (#2955). Thanks @Maxim-Mazurok.
Fix #2959: typo in an example in the docs. Thanks @kunalagrwl.
Drop official support for Node.js 14, has reached end of life.

2023-04-03, 11.8.0

Extended functions fraction, bignumber, and number with support for units, see #2918 (#2926).
Implemented aliases amp and amps for unit ampere (#2917). Thanks @veggiesaurus.
Improve TypeScript definitions of function gcd (#2922). Thanks @brunoSnoww.
Fix #2923: improve docs of the function distance (#2924). Thanks @tmtron.

2023-03-15, 11.7.0

Implement #2567: accept array as parameter for function gcd (#2878). Thanks @jakubriegel.
Fix #2908: improvements in the docs and examples of functions partitionSelect, diff, expm1, round, nthRoots, sign, rigthArithShift, setIsSubset, setSize, and the docs about units. Thanks @tmtron.
Fix #2907: determinant of empty matrix should be 1.
Refactor index.d.ts by writing function declarations using a generic, reducing a lot of repetition (#2913). Thanks @brunoSnoww.

2023-02-24, 11.6.0

Implement broadcasting for the following functions and their corresponding operator: add, dotDivide, dotMultiply, dotPow, gcd, lcm, mod, nthRoot, subtract, bitAnd, bitOr, bitXor, leftShift, rightArithShift, rightLogShift, and, or, xor, compare, compareText, equal, larger, largerEq, smaller, smallerEq, unequal, atan2 and to (#2895, #2753). Thanks @dvd101x.
Implement support for non-power-of-2 fft (#2900, #2577). Thanks @cyavictor88.
Fix #2888: update type definitions of function unit to allow creating a unit from a fraction or complex number.
Fix #2892: an error in the examples of the embedded help of function sort.
Fix #2891: functions column and row sometimes returning a scalar number.
Fix #2896: define the fourth argument of function intersect as optional in the TypeScript definitions. Thanks @wodndb.
Fix: quantileSeq not accepting a matrix as second argument prob (see #2902).
Fix broken examples in functions to, distance, getMatrixDataType, subset, and max (see #2902).

2023-01-31, 11.5.1

Add type definitions for function rotationMatrix (#2860). Thanks @brunoSnoww.
Add type signature for lusolve(LUDecomposition, ...) (#2864). Thanks @evanmiller.
Fix #2873: the rocket_trajectory_optimization.html example being partly broken. Thanks @dvd101x.
Fix #2871: coverage report broken (#2877). Thanks @bornova.
Fix #2883: update documentation for stat functions, describe missing syntax.
Fix #2884: fix examples in the embedded docs of function pow and some other functions.
Fix type definition of function complex for one numeric input (#2886), thanks @ariymarkowitz.
Fix type definitions of map() and forEach() (#2887), thanks @xiaohk.
Fix #2606: improve type definitions of dotMultiply, dotPow and dotDivide (#2890). Thanks @brunoSnoww.

2022-12-05, 11.5.0

Improve simplify rule matches in non-commutative contexts (#2841). Thanks @samueltlg.
Simplify: add rules and restructure tests for non-commutative contexts (#2847). Thanks @samueltlg.
Fix function reshape mutating the input in case of a matrix (see #2854).
Fix TypeScript types for multiply() with number[] and number[][] (#2852). Thanks @hfhchan.

2022-11-18, 11.4.0

Implemented more wildcards to describe rules for simplify, making it easier for example to describe unary minus (#1915). Thanks @thatcomputerguy0101.
Implemented functions schur, sylvester, and lyap (#2646). Thanks @egidioln.
Implemented function polynomialRoot, and use it in a benchmark (#2839). Thanks @gwhitney.
Fix #2825 partly: improve simplifying operations on constants in non-commutative contexts (#2827). Thanks @samueltlg.
Fix #2840: a bug in the docs and type definitions of Node.traverse and Node.forEach, they do return void.

2022-11-07, 11.3.3

Fix #2830: Prevent inserting zero values when creating a SparseMatrix from a DenseMatrix (#2836). Thanks @AlexandreAlvesDB.
Fix #2835: a regression in the type definitions of FunctionNode, introduced in v11.3.2. See #2733. Thanks @dsteve.

2022-10-25, 11.3.2

Add generics to remaining Node type definitions (#2733). Thanks @mattvague.
Allow unit prefixes for (absolute) temperatures kelvin, rankine, celsius, and fahrenheit (#2824). Thanks @jfeist

2022-10-19, 11.3.1

Fix #2809: code completion issues in some IDE's (#2812).
Fix #2818: throw an error when a function assignment has duplicate parameter names (#2819).
Update decimal.js to version 10.4.2.

2022-10-11, 11.3.0

Allow creating new subclasses of Node in TypeScript (#2772). Note that this disables being able to narrow MathNodes by using the .type property. Use typeguards like isOperatorNode(...) instead (see #2810). Thanks @mattvague.
Fix #2793: flatten() cloning entries of array/Matrix (#2799).
Fix #2627: TypeScript definitions of pinv missing (#2804). Thanks @HanchaiN.
Update dependencies to decimal.js@10.4.1.

2022-09-13, 11.2.1

Fix doc generator being broken, not generating a function reference.

2022-09-12, 11.2.0

Implement function isRelationalNode (#2731). Thanks @isaacbyr.
Added missing types 'largerEq' and 'or' in OperatorNodeMap in the TypeScript definitions. Thanks @ajinkyac03.
Fixed typos in min func type defs (#2768). Thanks @mabdullahadeel.
Improved the TypeScript definitions for pickRandom. Thanks @mattvague.
Fixed documentation of unit min which means minutes, not minim (#2773). Thanks @jasonhornsby.

2022-08-23, 11.1.0

Add Unit constructor from value and pure (valueless) Unit (#2628). Thanks @costerwi
Fix #2144: examples/advanced/custom_loading.js was broken.
Fix JSON replacer function missing in the TypeScript definitions. Thanks @mattvague.
Update dependencies to typed-function@4.1.0 and decimal.js@10.4.0.

2022-07-25, version 11.0.1

Fix #2632: TypeScript issue of simplifyConstant and simplifyCore not having a return type defined.

2022-07-23, version 11.0.0

!!! BE CAREFUL: BREAKING CHANGES !!!

Breaking changes:

Dropped official support for IE11.
Upgraded to typed-function@3, see josdejong/typed-function/HISTORY.md. Thanks @gwhitney. Most importantly:
- Conversions now have preference over any.
- The this variable is no longer bound to the typed function itself.
- The properties typed.types, typed.conversions, and typed.ignore have been removed.
- There are new static functions available like typed.referTo, typed.referToSelf, typed.addTypes, typed.addConversions.
Implement amended "Rule 2" for implicit multiplication (#2370, #2460): when having a division followed by an implicit multiplication, the division gets higher precedence over the implicit multiplication when (a) the numerator is a constant with optionally a prefix operator (-, +, ~), and (b) the denominator is a constant. For example: formerly -1 / 2 x was interpreted as -1 / (2 * x) and now it is interpreted as (-1 / 2) * x. Thanks @gwhitney.
Drop elementwise matrix support for trigonometric functions, exp, log, gamma, square, sqrt, cube, and cbrt to prevent confusion with standard matrix functions (#2440, #2465). Instead, use math.map(matrix, fn). Thanks @gwhitney.
Simplify: convert equivalent function calls into operators, for example, add(2, x) will now be simplified into 2 + x (#2415, #2466). Thanks @gwhitney.
Removed the automatic conversion from number to string (#2482). Thanks @gwhitney.
Fix #2412: let function diff return an empty matrix when the input contains only one element (#2422).
Internal refactoring in the simplifyCore logic (#2490, #2484, #2459). The function simplifyCore will no longer (partially) merge constants, that behavior has been moved to simplifyConstant. The combination of simplifyConstant and simplifyCore is still close to the old behavior of simplifyCore, but there are some differences. To reproduce the same behavior as the old simplifyCore, you can use math.simplify(expr, [math.simplifyCore, math.simplifyConstant]). Thanks to the refactoring, simplify is more thorough in reducing constants. Thanks @gwhitney.
Disable support for splitting rest parameters in chained calculations (#2485, #2474). For example: math.chain(3).max(4, 2).done() will now throw an error rather than return 4, because the rest parameter of math.max(...number) has been split between the contents of the chain and the arguments to the max call. Thanks @gwhitney.
Function typeOf now returns function (lowercase) for a function instead of Function (#2560). Thanks @gwhitney.

Non-breaking changes:

Fix #2600: improve the TypeScript definitions of simplify. Thanks @laureen-m and @mattvague.
Fix #2607: improve type definition of createUnit. Thanks @egziko.
Fix #2608: clarify the docs on the need to configure a smaller epsilon when using BigNumbers.
Fix #2613: describe matrix methods get and set in the docs.
Fix link to math.rationalize in the docs (#2616). Thanks @nukisman.
Fix #2621: add TypeScript definitions for count (#2622). Thanks @Hansuku.
Improved TypeScript definitions of multiply (#2623). Thanks @Windrill.

2022-06-28, version 10.6.4

Improve TypeScript definitions of the factory function, thanks @mattvague.

2022-06-24, version 10.6.3

Revert the TypeScript definition fixes for factory applied in v10.6.2, they give some complications.

2022-06-24, version 10.6.2

Improve TypeScript definitions of ParenthesisNode. Thanks @mattvague.
Change the TypeScript definition of MathNodeCommon['type'] into a less strict string, so it is possible to extend with new Node classes. Thanks @mattvague.
Improve TypeScript definitions of the factory function, thanks @mattvague.

2022-05-31, version 10.6.1

Improve the TypeScript types For OperatorNode: you can now define generic types like OperatorNode<'+', 'add'>. Thanks @mattvague.

2022-05-24, version 10.6.0

Implementation of fourier transform functions fft and ifft (#2540). Thanks @HanchaiN.
Fix TypeScript types not being listed in the exported fields (#2569). Thanks @mattvague.
Large improvements in TypeScript definitions for chained expressions (#2537). Thanks @mattvague.
Fix #2571: improve TypeScript definition of functions clone and cloneDeep (#2572). Thanks @mattvague.
Fix the first argument of derivative holding the expression not correctly being converted when using .toTex() (#2564). Thanks @mattvague.

2022-05-11, version 10.5.3

Fix #2337: npm package containing examples and docs to solve security vulnerabilities being reported on the examples and their dependencies.
Fix core, construction, and some other functions missing in docs.
Drop official support for Node.js 12 which has reached its end of life.

2022-05-09, version 10.5.2

Fix #2553: @types/mocha defined in dependencies instead of devDependencies, causing problems in projects that use a different version of this dependency. Thanks @Kolahzary.
Fix #2550: remove examples/node_modules folder from the npm package.
Fix #2528: improve contribution guidelines (#2548).
Document SymbolNode.onUndefinedSymbol and FunctionNode.onUndefinedFunction.

2022-05-02, version 10.5.1

Fix #2526, #2529: improve TypeScript definitions of function round, fix, floor, ceil, and nthRoot, and improved the number only implementations of those functions (#2531, #2539). Thanks @simlaticak and @gwhitney.
Fix #2532: matrix index symbol end not working when used inside a sub-expression.
Fix #2524: In generating AUTHORS list, ignore a list of specific commits (e.g., to avoid spurious duplicates in list). (#2543)
Add type definitions of function resolve (#2536). Thanks @mattvague.

2022-04-19, version 10.5.0

Implement #1563: function pinv, Moore–Penrose inverse (#2521). Thanks @HanchaiN.
Optimize function det for integers by switching to the Bareiss algorithm: no more round-off errors for integer input (#2516). Thanks @HanchaiN.
Implement #2463: allow negative integer powers of invertible square matrices (#2517). Thanks @HanchaiN.
Implement the lgamma function (defined as log(gamma(z))) for number and Complex types. Supersedes #320. (#2417). Thanks @yifanwww.
Fix #2523: update to the latest complex.js to improve sin(z) for small im(z) (#2525). Thanks @gwhitney.
Fix #2526: update TypeScript definition of ceil (#2531). Thanks @simlaticak
Change mocha reporter to 'dot' to avoid excessively long log files. (#2520)

2022-04-08, version 10.4.3

Fix #2508: improve the precision of stirlingS2 (#2509). Thanks @gwhitney.
Fix #2514: implement optional argument base in the number implementation of function log (#2515). Thanks @gwhitney.
Improve the documentation on operator ; (#2512). Thanks @gwhitney.

2022-03-29, version 10.4.2

Fix #2499: different behavior for unit conversion "degC" and "K" (#2501). Also disables getting the sign for units with an offset, which is ambiguous. Thanks @gwhitney.
Fix #2503: fix an issue in log() for complex numbers in which the imaginary part is much larger in absolute value than the real part, fixed in complex.js@2.1.0 (#2505), thanks @gwhitney, @infusion.
Fix #2493: unclear error message when an entity that is not a function is being called as a function (#2494). Thanks @gwhitney.
Some fixes in the docs on units (#2498). Thanks @dvd101x.
Add forEach example in embedded docs (#2507). Thanks @dvd101x.
Correct approx.deepEqual() to accept an epsilon argument giving the comparison tolerance. It was already being called this way, but was silently ignoring the tolerance. Thanks @yifanwww.

2022-03-23, version 10.4.1

Improve TypeScript definitions for function unit (#2479). Thanks @SinanAkkoyun.
Add tests for type declarations (#2448). Thanks @samestep.
Further improvement to TypeScript definitions of std and variance (make dimension parameter optional, #2474). Thanks @NattapongSiri.
Next step (as per #2431) for full publication of "is" functions like isMatrix etc: Provide TypeScript definitions of "is" functions and make them type guards. (#2432). Thanks @ChristopherChudzicki.
Fix #2491: Multi line object expressions don't work with comments (#2492). Thanks @gwhitney.
Fix #2478: a bug in calculating the eigenvectors when dealing with complex numbers (#2496). Thanks @gwhitney.
Update project dependencies and devDependencies.

2022-03-07, version 10.4.0

Fix #2461: make sure simplifyCore recurses over all binary nodes (#2462). Thanks @gwhitney.
Fix #2429: fix the TypeScript definitions of functions std and variance (#2455). Thanks @NattapongSiri.
Fix #1633: implement a cumsum function generating cumulative sums of a list of values or a matrix. (#1870). Thanks @hjonasson.
Upgrade to the latest version of Fraction.js, having more strict input, only accepting an integer numerator and denominator. See #2427.
Fix typo in documentation example for format. (#2468) Thanks @abranhe.
Write unit tests for all jsdoc examples. See #2452. Thanks @gwhitney.

2021-03-02, version 10.3.0

Fix #1260: implement function symbolicEqual (#2424). Thanks @gwhitney.
Fix #2441, #2442: support passing a function as argument to functions created in the expression parser (#2443). Thanks @gwhitney.
Fix #2325: improve documentation of subset indices (#2446). Thanks @gwhitney.
Fix #2439: fix a bug in complexEigs in which real-valued norms were inadvertently being typed as complex numbers (#2445). Thanks @gwhitney.
Fix #2436: improve documentation and error message of function map (#2457). Thanks @gwhitney.

2022-03-01, version 10.2.0

Implemented context options to control simplifications allowed in simplify, see #2399, #2391. Thanks @gwhitney.
Implemented function leafCount as a first simple measure of the complexity of an expression, see #2411, #2389. Thanks @gwhitney.
Fix #2413: improve combinations to return an integer result without rounding errors for larger values, see #2414. Thanks @gwhitney.
Fix #2385: function rotate missing in TypeScript definitions. Thanks @DIVYA-19.
Fix #2450: Add BigNumber to parameter type in math.unit and add TypeScript types for Unit.simplify and Unit.units (#2353). Thanks @joshhansen.
Fix #2383: detect infinite loops in simplify (#2405). Thanks @gwhitney.
Fix #1423: collect like factors and cancel like terms in sums (#2388). Thanks @gwhitney.

2022-02-02, version 10.1.1

Improvements and fixes in function simplify, thanks @gwhitney:
- Fix #2393: regression bug in simplify('2-(x+1)').
- Ad option consoleDebug to simplify to see what is going on.
Fix TypeScript definition of ConfigOptions, which was missing option predictable.

2022-01-15, version 10.1.0

Implemented function invmod, see #2368, #1744. Thanks @thetazero.
Improvements and fixes in function simplify, thanks @gwhitney:
- Fix #1179, #1290: improve collection of non-constant like terms (#2384).
- Fix #2152: do not transform strings into numbers (#2372).
- Fix #1913: implement support for array and object simplification (#2382).
Fix #2379: add embedded documentation for function print.
Remove broken example from the embedded documentation of function forEach.

2021-12-29, version 10.0.2

Fix #2156: simplify expressions like -1 / (-x) to 1/x. Thanks @ony3000.
Fix #2363: remove a redundant part of the regex to split a number.
Fix #2291: add support for fractions in function intersect. Thanks @thetazero.
Fix #2358: bug in SparseMatrix when replacing a subset of a matrix with a non-consecutive index. Thanks @Al-0.

2021-12-22, version 10.0.1

Fix #1681: function gamma giving inaccurate complex results in some cases. Thanks @kmdrGroch.
Fixed a typo in an example, see #2366. Thanks @blackwindforce.

2021-11-03, version 10.0.0

!!! BE CAREFUL: BREAKING CHANGES IN THE TYPESCRIPT DEFINITIONS !!!

Improvements to the Typescript typings (commit fc5c202e). Thanks @joshhansen. First introduced in v9.5.1, but reverted because it contains breaking changes.

Breaking changes: interface MathNode is now renamed to MathNodeCommon and the related interfaces are structured in a different way.
Fixed a typo in the TypeScript definition of toHTML. Thanks @TheToto.

2021-11-03, version 9.5.2`

Revert the improvements to the Typescript typings because they contain breaking changes. The improvements will be published in v10.0.0. See #2339.

2021-10-13, version 9.5.1

Various improvements to the Typescript typings. Thanks @joshhansen and @DianaTdr.

2021-09-22, version 9.5.0

Implemented support for calculations with percentage, see #2303. Thanks @rvramesh.
Fix #2319: make the API of Parser.evaluate consistent with math.evaluate: support a list with expressions as input.
Improved documentation of function setCartesian. Thanks @fieldfoxWim.

2021-09-15, version 9.4.5

Improved the performance of Node.equals by improving the internal function deepStrictEqual. Thanks @tomlarkworthy.
Fixes in the TypeScript definitions:
- Define hasNumericValue. Thanks @write2kcl.
- Define MathNode.isRelationalNode. Thanks @m93a.
- Fix typo in MathNode.isConditionalNode. Thanks @m93a.

2021-07-07, version 9.4.4

Fixed ArrayNode.toTex(): remove the row delimiter on the last row, see #2267. Thanks @davidtranhq.
Fix #2269: intersect not returning null for matrix input. Thanks @m93a.
Fix #2245: mathjs not working in IE11 anymore due to a missing polyfill for Symbol. The browser bundle now includes the necessary polyfills (it is larger now because of that, see also #2266). Thanks @m93a.
Update dependencies (complex.js@2.0.15, decimal.js@10.3.1)
Drop official support for node.js 10, which has reached end of life. See #2258.

2021-06-23, version 9.4.3

Fix #2222: mathjs polluting the Decimal prototype. Thanks @m93a.
Fix #2253: expression parser throwing an error when accessing nested object properties named e.
Fixes in the TypeScript definitions:
- function floor, #2159, #2246. Thanks @write2kcl.
- function simplify, see #2252. Thanks @nitroin.
Upgraded to decimal.js@10.3.0

2021-06-05, version 9.4.2

Implemented iterative eigenvalue finder for eigs, making it much more robust. See #2179, #2237. Thanks @m93a.
Improved TypeScript definitions of function parse. Thanks @OpportunityLiu.

2021-05-24, version 9.4.1

Fix #2100: add TypeScript declaration for eigs. Thanks @andrebianchessi.
Fix #2220: add TypeScript files to published npm package. Thanks @dhritzkiv.
Update readme regarding TypeScript definition files. Thanks @dhritzkiv.
Update to fraction.js@4.1.1

2021-05-16, version 9.4.0

Implemented support to use objects with a Map interface as scope, see #2143, #2166. Thanks @jhugman.
Extend eigs to support general complex matrices, see #1741. Thanks @m93a.
DenseMatrix and SparseMatrix are now iterable, see #1184. Thanks @m93a.
Implemented utility functions matrixFromRows, matrixFromColumns, and matrixFromFunction, see #2155, #2153. Thanks @m93a.
Added TypeScript definitions to the project, making it redundant to install @types/mathjs, and making it easier to improve the definitions. See #2187, #2192. Thanks @CatsMiaow.
Upgraded dependencies
- complex.js@2.0.13 (fixing #2211). Thanks @infusion
- fraction.js@4.1.0 (pow now supporting rational exponents).
Fix #2174: function pickRandom having no name. Thanks @HK-SHAO.
Fix #2019: VSCode auto import keeps adding import { null } from 'mathjs'.
Fix #2185: Fix TypeScript definition of unit division, which can also return a number.
Fix #2123: add type definitions for functions row and column.
Fix some files not exposed in the package, see #2213. Thanks @javiermarinros.

2021-04-12, version 9.3.2

Fix #2169: mathjs requesting @babel/runtime dependency. Regression introduced in v9.3.1.

2021-04-10, version 9.3.1

Fix #2133: strongly improved the performance of isPrime, see #2139. Thanks @Yaffle.
Fix #2150: give a clear error "Error: Undefined function ..." instead when evaluating a non-existing function.
Fix #660: expose internal functions FunctionNode.onUndefinedFunction(name) and SymbolNode.onUndefinedSymbol(name), allowing to override the behavior. By default, an Error is thrown.

2021-03-10, version 9.3.0

Implemented support for parsing non decimal numbers with radix point, see #2122, #2121. Thanks @clnhlzmn.
Fix #2128: typo in docs of luSolveAll and usolveAll.

2021-02-03, version 9.2.0

Implemented function count to count the total elements in a matrix, see #2085. Thanks @Josef37.
Fix #2096: cleanup old reference to external dependency crypto.
Some refactoring in the code to remove duplications, see #2093. Thanks @Josef37.

2021-01-27, version 9.1.0

Extended function reshape with support for a wildcard -1 to automatically calculate the remaining size, like reshape([1, 2, 3, 4, 5, 6], [-1, 2]) which will output [[0, 1], [2, 3], [4, 5]]. See #2075. Thanks @Josef37.
Fix #2087: function simplify ignores second argument of log, for example in simplify('log(e, 9)') . Thanks @quentintruong.

2021-01-16, version 9.0.0

Improved support for bin, hex, and oct literals. See #1996. Thanks @clnhlzmn.
- Breaking change: parse literals with prefixes 0b, 0c, and 0x are
  now unsigned by default. To parse them as signed, you have to specify a suffix specifying the word size such as i16 or i32.
- Function format now supports more notations: bin, 'hex', and oct, for example format(255, {notation: "hex"}).
- The functions format, bin, hex, oct now allow specifying a wordSize, like bin(10, 32) and format(10, {notation: "bin", wordSize: 32}).
- BigNumber support for the bin, hex, and oct literals.
Extended and improved the example rocket_trajectory_optimization.html. Thanks @Josef37.

2020-12-30, version 8.1.1

Improved the performance of parsing and evaluating units a lot, see #2065. Thanks @flaviut.
Upgraded dependency fraction.js to v4.0.13.
Moved continuous integration testing from Travis CI to Github Workflow, see #2024, #2041. Thanks @harrysarson.

2020-12-04, version 8.1.0

Implemented units kilogramforce (kgf). Thanks @rnd-debug.
Fix #2026: Implement a new option fractionsLimit for function simplify, defaulting to Infinity.
Improved the documentation of function clone. Thanks @redbar0n.

2020-11-09, version 8.0.1

Fix #1979: missing "subset" dependency when using "mathjs/number" entry point.
Fix #2022: update pretty printing with MathJax example to the latest version of MathJax. Thanks @pkra.

2020-11-06, version 8.0.0

!!! BE CAREFUL: BREAKING CHANGES !!!

You can now use mathjs directly in node.js using ES modules without need for a transpiler (see #1928, #1941, #1962). Automatically loading either commonjs code or ES modules code is improved. All generated code is moved under /lib: the browser bundle is moved from /dist to /lib/browser, ES module files are moved to /lib/esm, and commonjs files are moved to /lib/cjs. Thanks @GreenImp.
Non-minified bundle dist/math.js is no longer provided. Either use the minified bundle, or create a bundle yourself.
Replaced random library seed-random with seedrandom, see #1955. Thanks @poppinlp.
Breaking changes in pickRandom, see #1990, #1976.
- Will no longer return the input matrix when the given number is greater than the length of the provided possibles. Instead, the function always returns results with the requested number of picks.
- Will now return a Matrix as output when input was a Matrix.
- Introduced a new syntax:
```
math.pickRandom(array, { weights, number, elementWise })
```
- Introduced a new option elementWise, which is true by default. When setting elementWise to false, an array containing arrays will return random pick of arrays instead of the elements inside of the nested arrays.

2020-11-02, version 7.6.0

Implemented function rotate(w, theta). See #1992, #1160. Thanks @rnd-debug.
Implemented support for custom characters in Units via Unit.isValidAlpha. See #1663, #2000. Thanks @rnd-debug.

2020-10-10, version 7.5.1

Fix object pollution vulnerability in math.config. Thanks Snyk.

2020-10-07, version 7.5.0

Function pickRandom now allows randomly picking elements from matrices with 2 or more dimensions instead of only from a vector, see #1974. Thanks @KonradLinkowski.

2020-10-07, version 7.4.0

Implemented support for passing a precision in functions ceil, floor, and fix, similar to round, see #1967, #1901. Thanks @rnd-debug.
Implemented function rotationMatrix, see #1160, #1984. Thanks @rnd-debug.
Implement a clear error message when using sqrtm with a matrix having more than two dimensions. Thanks @KonradLinkowski.
Update dependency decimal.js to 10.2.1.

2020-09-26, version 7.3.0

Implemented functions usolveAll and lsolveAll, see #1916. Thanks @m93a.
Implemented support for units in functions std and variance, see #1950. Thanks @rnd-debug.
Implemented support for binary, octal, and hexadecimal notation in the expression parser, and implemented functions bin, oct, and hex for formatting. Thanks @clnhlzmn.
Fix #1964: inconsistent calculation of negative dividend modulo for BigNumber and Fraction. Thanks @ovk.

2020-08-24, version 7.2.0

Implemented new function diff, see #1634, #1920. Thanks @Veeloxfire.
Implemented support for norm 2 for matrices in function norm. Thanks @rnd-debug.

2020-07-13, version 7.1.0

Implement support for recursion (self-referencing) of typed-functions, new in typed-function@2.0.0. This fixes #1885: functions which where extended with a new data type did not always work. Thanks @nickewing.
Fix #1899: documentation on expression trees still using old namespace math.expression.node.* instead of math.*.

2020-06-24, version 7.0.2

Fix #1882: have DenseMatrix.resize and SparseMatrix.resize accept DenseMatrix and SparseMatrix as inputs too, not only Array.
Fix functions sum, prod, min, and max not throwing a conversion error when passing a single string, like sum("abc").

2020-05-30, version 7.0.1

Fix #1844: clarify the documentation of function eigs. Thanks @Lazersmoke.
Fix #1855: Fix error in the documentation for math.nthRoots(x).
Fix #1856: make the library robust against Object prototype pollution.

2020-05-07, version 7.0.0

Breaking changes:

Improvements in calculation of the dot product of complex values. The first argument is now conjugated. See #1761. Thanks @m93a.
Dropped official support for Node.js v8 which has reached end of life.
Removed all deprecation warnings introduced in v6. To upgrade smoothly from v5 to v7 or higher, upgrade to v6 first and resolve all deprecation warnings.

2020-05-04, version 6.6.5

Fix #1834: value Infinity cannot be serialized and deserialized. This is solved now with a new math.replacer function used as JSON.stringify(value, math.replacer).
Fix #1842: value Infinity not turned into the latex symbol \\infty.

2020-04-15, version 6.6.4

Fix published files containing Windows line endings (CRLF instead of LF).

2020-04-10, version 6.6.3

Fix #1813: bug in engineering notation for numbers of function format, sometimes resulting in needless trailing zeros.
Fix #1808: methods .toNumber() and .toNumeric() not working on a unitless unit.
Fix #1645: not being able to use named operators mod, and, not, or, xor, to, in as object keys. Thanks @Veeloxfire.
Fix eigs not using config.epsilon.

2020-03-29, version 6.6.2

Fix #1789: Function eigs not calculating with BigNumber precision when input contains BigNumbers.
Run the build script during npm prepare, so you can use the library directly when installing directly from git. See #1751. Thanks @cinderblock.

2020-02-26, version 6.6.1

Fix #1725: simplify a/(b/c). Thanks @dbramwell.
Fix examples in documentation of row and column.

2020-02-01, version 6.6.0

Implemented function eigs, see #1705, #542 #1175. Thanks @arkajitmandal.
Fixed #1727: validate matrix size when creating a DenseMatrix using fromJSON.
Fixed DenseMatrix.map copying the size and datatype from the original matrix instead of checking the returned dimensions and type of the callback.
Add a caret to dependencies (like) ^1.2.3) to allow downstream updates without having to await a new release of mathjs.

2020-01-08, version 6.5.0

Implemented baseName option for createUnit, see #1707. Thanks @ericman314.

2020-01-06, version 6.4.0

Extended function dimension with support for n-dimensional points. Thanks @Veeloxfire.

2019-12-31, version 6.3.0

Improved performance of factorial for BigNumber up to a factor two, see #1687. Thanks @kmdrGroch.

2019-11-20, version 6.2.5

Fixed IndexNode using a hardcoded, one-based implementation of index, making it impossible to instantiate a zero-based version of the expression parser. See #782.

2019-11-20, version 6.2.4

Fixed #1669: function 'qr' threw an error if the pivot was zero, thanks @kevinkelleher12 and @harrysarson.
Resolves #942: remove misleading assert in 'qr'. Thanks @harrysarson.
Work around a bug in complex.js where sign(0) returns complex NaN. Thanks @harrysarson.

2019-10-06, version 6.2.3

Fixed #1640: function mean not working for units. Thanks @clintonc.
Fixed #1639: function min listed twice in the "See also" section of the embedded docs of function std.
Improved performance of isPrime, see #1641. Thanks @arguiot.

2019-09-23, version 6.2.2

Fixed methods map and clone not copying the dotNotation property of IndexNode. Thanks @rianmcguire.
Fixed a typo in the documentation of toHTML. Thanks @maytanthegeek.
Fixed #1615: error in the docs of isNumeric.
Fixed #1628: Cannot call methods on empty strings or numbers with value 0.

2019-08-31, version 6.2.1

Fixed #1606: function format not working for expressions.

2019-08-28, version 6.2.0

Improved performance of combinationsWithRep. Thanks @waseemyusuf.
Add unit aliases bit and byte.
Fix docs referring to bit and byte instead of bits and bytes.
Updated dependency typed-function@1.1.1.

2019-08-17, version 6.1.0

Implemented function combinationsWithRep (see #1329). Thanks @waseemyusuf.

2019-08-05, version 6.0.4

Fixed #1554, #1565: ES Modules where not transpiled to ES5, giving issues on old browsers. Thanks @mockdeep for helping to find a solution.

2019-07-07, version 6.0.3

Add unpkg and jsdelivr fields in package.json pointing to UMD build. Thanks @tmcw.
Fix #1550: nested user defined function not receiving variables of an outer user defined function.

2019-06-11, version 6.0.2

Fix not being able to set configuration after disabling function import (regression since v6.0.0).

2019-06-09, version 6.0.1

Fix function reference not published in npm library.
Fix function evaluate and parse missing in generated docs.

2019-06-08, version 6.0.0

!!! BE CAREFUL: BREAKING CHANGES !!!

Most notable changes

Full support for ES modules. Support for tree-shaking out of the box.

Load all functions:

import * as math from 'mathjs'

Use a few functions:

import { add, multiply } from 'mathjs'

Load all functions with custom configuration:

import { create, all } from 'mathjs'
const config = { number: 'BigNumber' }
const math = create(all, config)

Load a few functions with custom configuration:

import { create, addDependencies, multiplyDependencies } from 'mathjs'
const config = { number: 'BigNumber' }
const { add, multiply } = create({
  addDependencies,
  multiplyDependencies
}, config)

Support for lightweight, number-only implementations of all functions:
```
import { add, multiply } from 'mathjs/number'
```
New dependency injection solution used under the hood.

Breaking changes

Node 6 is no longer supported.

Functions config and import are not available anymore in the global context:

// v5
import * as mathjs from 'mathjs'
mathjs.config(...) // error in v6.0.0
mathjs.import(...) // error in v6.0.0

Instead, create your own mathjs instance and pass config and imports there:

// v6
import { create, all } from 'mathjs'
const config = { number: 'BigNumber' }
const mathjs = create(all, config)
mathjs.import(...)

Renamed function typeof to typeOf, var to variance, and eval to evaluate. (the old function names are reserved keywords which can not be used as a variable name).
Deprecated the Matrix.storage function. Use math.matrix instead to create a matrix.
Deprecated function math.expression.parse, use math.parse instead. Was used before for example to customize supported characters by replacing math.parse.isAlpha.
Moved all classes like math.type.Unit and math.expression.Parser to math.Unit and math.Parser respectively.
Fixed #1428: transform iterating over replaced nodes. New behavior is that it stops iterating when a node is replaced.
Dropped support for renaming factory functions when importing them.
Dropped fake BigNumber support of function erf.

Removed all index.js files used to load specific functions instead of all, like:

// v5
// ... set up empty instance of mathjs, then load a set of functions:
math.import(require('mathjs/lib/function/arithmetic'))

Individual functions are now loaded simply like:

// v6
import { add, multiply } from 'mathjs'

To set a specific configuration on the functions:

// v6
import { create, addDependencies, multiplyDependencies } from 'mathjs'
const config = { number: 'BigNumber' }
const math = create({ addDependencies, multiplyDependencies }, config)

See example advanced/custom_loading.js.

Updated the values of all physical units to their latest official values. See #1529. Thanks @ericman314.

Non breaking changes

Implemented units t, tonne, bel, decibel, dB, and prefixes for candela. Thanks @mcvladthegoat.
Fixed epsilon setting being applied globally to Complex numbers.
Fix math.simplify('add(2, 3)') throwing an error.
Fix #1530: number formatting first applied lowerExp and upperExp and after that rounded the value instead of the other way around.
Fix #1473: remove 'use strict' in every file, not needed anymore.

2019-05-18, version 5.10.3

Fixed dependency del being a dependency instead of devDependency.

2019-05-18, version 5.10.2

Fix #1515, #1516, #1517: broken package due to a naming conflict in the build folder of a util file typeOf.js and typeof.js. Solved by properly cleaning all build folders before building.

2019-05-17, version 5.10.1

Fix #1512: format using notation engineering can give wrong results when the value has less significant digits than the number of digits in the output.

2019-05-08, version 5.10.0

Fix lib/header.js not having filled in date and version. Thanks @kevjin.
Upgraded dependency decimal.js@10.2.0, fixing an issue on node.js 12.

2019-04-08, version 5.9.0

Implemented functions row and column (see #1413). Thanks @SzechuanSage.
Fixed #1459: engineering notation of function format not available for BigNumber.
Fixed #1465: node.toHTML() not correct for unary operators like factorial.

2019-03-20, version 5.8.0

Implemented new function apply. Thanks @bnlcas.
Implemented passing an optional dimension argument to std and var. Thanks @bnlcas.

2019-03-10, version 5.7.0

Implemented support for pow() in derivative. Thanks @sam-19.
Gracefully handle round-off errors in fix, ceil, floor, and range (Fixes #1429, see also #1434, #1432). Thanks @ericman314.

2019-03-02, version 5.6.0

Upgrade decimal.js to v10.1.1 (#1421).
Fixed #1418: missing whitespace when stringifying an expression containing "not".

2019-02-20, version 5.5.0

Fixed #1401: methods map and forEach of SparseMatrix not working correctly when indexes are unordered.
Fixed #1404: inconsistent rounding of negative numbers.
Upgrade tiny-emitter to v2.1.0 (#1397).

2019-01-25, version 5.4.2

Fixed math.format not working for BigNumbers with a precision above 1025 digits (see #1385). Thanks @ericman314.
Fixed incorrect LaTeX output of RelationalNode. Thanks @rianmcguire.
Fixed a bug the methods map, forEach, traverse, and transform of FunctionNode.

2019-01-10, version 5.4.1

Fix #1378: negative bignumbers not formatted correctly.
Upgrade fraction.js to version 4.0.12 (#1369).

2018-12-09, version 5.4.0

Extended sum.js to accept a dimension input to calculate the sum over a specific axis. Thanks @bnlcas.
Fix #1328: objects can't be written multi-line. Thanks @GHolk.
Remove side effects caused by Unit.format and Unit.toString, making changes to the unit on execution. Thanks @ericman314.

2018-12-03, version 5.3.1

Fixed #1336: Unit.toSI() returning units with prefix like mm instead of m. Thanks @ericman314.

2018-11-29, version 5.3.0

Implemented function hasNumericValue. Thanks @Sathish-kumar-Subramani.
Fix #1326: non-ascii character in print.js.
Fix #1337: math.format not working correctly with { precision: 0 }. Thanks @dkenul.

2018-10-30, version 5.2.3

Fixed #1293: non-unicode characters in escape-latex giving issues in some specific cases. Thanks @dangmai.
Fixed incorrect LaTeX output of function bitNot, see #1299. Thanks @FSMaxB.
Fixed #1304: function pow not supporting inputs pow(Unit, BigNumber).
Upgraded dependencies (escape-latex@1.2.0)

2018-10-23, version 5.2.2

Fixed #1286: Fixed unit base recognition and formatting for user-defined units. Thanks @ericman314.

2018-10-18, version 5.2.1

Fixed unit rod being defined as 5.02921 instead of 5.0292. Thanks @ericman314.
Upgraded dependencies (fraction.js@4.0.10)
Upgraded devDependencies (@babel/core@7.1.2, nyc@13.1.0, webpack@4.21.0).

2018-10-05, version 5.2.0

Implemented support for chained conditionals like 10 < x <= 50. Thanks @ericman314.
Add an example showing a proof of concept of using BigInt in mathjs.
Fixed #1269: Bugfix for BigNumber divided by unit. Thanks @ericman314.
Fixed #1240: allow units having just a value and no unit. Thanks @ericman314.

2018-09-09, version 5.1.2

Fixed a typo in the docs of parse. Thanks @mathiasvr.
Fixed #1222: a typo in the docs of subset.
Fixed #1236: quantileSeq has inconsistent return.
Fixed #1237: norm sometimes returning a complex number instead of number.
Upgraded dependencies (fraction.js@4.0.9)
Upgraded devDependencies (babel@7, karma-webpack@3.0.4, nyc@13.0.1, standard@12.0.0, uglify-js@3.4.9, webpack@4.17.2)

2018-08-21, version 5.1.1

Function isNumeric now recognizes more types.
Fixed #1214: functions sqrt, max, min, var, std, mode, mad, median, and partitionSelect not neatly handling NaN inputs. In some cases (median, mad, and partitionSelect) this resulted in an infinite loop.
Upgraded dependencies (escape-latex@1.1.1)
Upgraded devDependencies (webpack@4.17.0)

2018-08-12, version 5.1.0

Implemented support for strings enclosed in single quotes. Thanks @jean-emmanuel.
Implemented function getMatrixDataType. Thanks @JasonShin.
Implemented new options argument in simplify. Thanks @paulobuchsbaum.
Bug fixes in rationalize, see #1173. Thanks @paulobuchsbaum.

2018-07-22, version 5.0.4

Strongly improved the performance of functions factorial for numbers. This improves performance of functions gamma, permutation, and combination too. See #1170. Thanks @honeybar.
Strongly improved the performance of function reshape, thanks to a friend of @honeybar.

2018-07-14, version 5.0.3

Fixed many functions (for example add and subtract) not working with matrices having a datatype defined.
Fixed #1147: bug in format with engineering notation in outputting the correct number of significant figures. Thanks @ericman314.
Fixed #1162: transform functions not being cleaned up when overriding it by importing a factory function with the same name.
Fixed broken links in the documentation. Thanks @stropitek.
Refactored the code of parse into a functional approach. Thanks @harrysarson.
Changed decimal.js import to ES6. Thanks @weinshel.

2018-07-07, version 5.0.2

Fixed #1136: rocket trajectory example broken (since v4.0.0).
Fixed #1137: simplify unnecessarily replacing implicit multiplication with explicit multiplication.
Fixed #1146: rationalize throwing exceptions for some input with decimals. Thanks @maruta.
Fixed #1088: function arguments not being passed to rawArgs functions.
Fixed advanced example add_new_datatypes.
Fixed mathjs core constants not working without complex numbers. Thanks @ChristopherChudzicki.
Fixed a broken link in the documentation on units. Thanks @stropitek.
Upgraded dependencies (typed-function@1.0.4, complex.js@2.0.11).
Upgraded devDependencies (babel-loader@7.1.5 , uglify-js@3.4.3, expr-eval@1.2.2, webpack@4.15.1).

2018-07-01, version 5.0.1

Improved error messaging when converting units. Thanks @gap777.
Upgraded devDependencies (kerma, uglify-js, webpack).

2018-06-16, version 5.0.0

!!! BE CAREFUL: BREAKING CHANGES !!!

Implemented complex conjugate transpose math.ctranspose. See #1097. Thanks @jackschmidt.
Changed the behavior of A' (transpose) in the expression parser to calculate the complex conjugate transpose. See #1097. Thanks @jackschmidt.
Added support for complex({abs: 1, arg: 1}), and improved the docs on complex numbers. Thanks @ssaket.
Renamed eye to identity, see #1054.
Math.js code can now contain ES6. The ES6 source code is moved from lib to src, and lib now contains the compiled ES5 code.
Upgraded dependencies:
- decimal.js from 9.0.1 to 10.0.1
- Upgraded dev dependencies
Changed code style to https://standardjs.com/, run linter on npm test. See #1110.
Dropped support for bower. Use npm or an other package manages instead.
Dropped support for (non-primitive) instances of Number, Boolean, and String from functions clone and typeof.
Dropped official support for IE9 (probably still works, but it's not tested).
Fixed #851: More consistent behavior of sqrt, nthRoot, and pow. Thanks @dakotablair.
Fixed #1103: Calling toTex on node that contains derivative causing an exception. Thanks @joelhoover.

2018-06-02, version 4.4.2

Drastically improved the performance of det. Thanks @ericman314.
Fixed #1065, #1121: Fixed wrong documentation of function compareNatural and clarified the behavior for strings.
Fixed #1122 a regression in function inv (since v4.4.1). Thanks @ericman314.

2018-05-29, version 4.4.1

Fixed #1109: a bug in inv when dealing with values close to zero. Thanks @ericman314.

2018-05-28, version 4.4.0

Implemented functions equalText and compareText. See #1085.

2018-05-21, version 4.3.0

Implemented matrix exponential math.expm. Thanks @ericman314.
Fixed #1101: math.js bundle not working when loading in a WebWorker.
Upgraded dependencies
- complex.js from v2.0.2 to v2.0.10.
- fraction.js from v4.0.4 to v4.0.8.
Upgraded devDependencies (mocha, uglify-js, webpack).

2018-05-05, version 4.2.2

Fixed calculating the Frobenius norm of complex matrices correctly, see #1098. Thanks @jackschmidt.
Fixed #1076: cannot use mathjs in React VR by updating to escape-latex@1.0.3.

2018-05-02, version 4.2.1

Fixed dist/math.js being minified.

2018-05-02, version 4.2.0

Implemented function math.sqrtm. Thanks @ferrolho.
Implemented functions math.log2, math.log1p, and math.expm1. Thanks @BigFav and @harrysarson.
Fixed some unit tests broken on nodejs v10.
Upgraded development dependencies.
Dropped integration testing on nodejs v4.

2018-04-18, version 4.1.2

Fixed #1082: implemented support for unit plurals decades, centuries, and millennia.
Fixed #1083: units decade and watt having a wrong name when stringifying. Thanks @ericman314.

2018-04-11, version 4.1.1

Fixed #1063: derivative not working when resolving a variable with unary minus like math.derivative('-x', 'x').

2018-04-08, version 4.1.0

Extended function math.print with support for arrays and matrices. Thanks @jean-emmanuel.
Fixed #1077: Serialization/deserialization to JSON with reviver not being supported by nodes.
Fixed #1016: Extended math.typeof with support for ResultSet and nodes like SymbolNode.
Fixed #1072: Added support for long and short prefixes for the unit bar (i.e. millibar and mbar).

2018-03-17, version 4.0.1

Fixed #1062: mathjs not working on ES5 browsers like IE11 and Safari 9.3.
Fixed #1061: math.unit not accepting input like 1/s.

2018-02-25, version 4.0.0

!!! BE CAREFUL: BREAKING CHANGES !!!

Breaking changes (see also #682):

New expression compiler

The compiler of the expression parser is replaced with one that doesn't use eval internally. See #1019. This means:
- a slightly improved performance on most browsers.
- less risk of security exploits.
- the code of the new compiler is easier to understand, maintain, and debug.
Breaking change here: When using custom nodes in the expression parser, the syntax of _compile has changed. This is an undocumented feature though.
Parsed expressions
- The class ConstantNode is changed such that it just holds a value instead of holding a stringified value and it's type. ConstantNode(valueStr, valueType) is now ConstantNode(value) Stringification uses math.format, which may result in differently formatted numeric output.
- The constants true, false, null, undefined, NaN, Infinity, and uninitialized are now parsed as ConstantNodes instead of SymbolNodes in the expression parser. See #833.
Implicit multiplication
- Changed the behavior of implicit multiplication to have higher precedence than explicit multiplication and division, except in a number of specific cases. This gives a more natural behavior for implicit multiplications. For example 24h / 6h now returns 4, whilst 1/2 kg evaluates to 0.5 kg. Thanks @ericman314. See: #792. Detailed documentation: https://github.com/josdejong/mathjs/blob/v4/docs/expressions/syntax.md#implicit-multiplication.
- Immediately invoking a function returned by a function like partialAdd(2)(3) is no longer supported, instead these expressions are evaluated as an implicit multiplication partialAdd(2) * (3). See #1035.
String formatting
- In function math.format, the options {exponential: {lower: number, upper: number}} (where lower and upper are values) are replaced with {lowerExp: number, upperExp: number} (where lowerExp and upperExp are exponents). See #676. For example:
```
math.format(2000, {exponential: {lower: 1e-2, upper: 1e2}})
```
  is now:
```
math.format(2000, {lowerExp: -2, upperExp: 2})
```
- In function math.format, the option notation: 'fixed' no longer rounds to zero digits when no precision is specified: it leaves the digits as is. See #676.
String comparison

Changed the behavior of relational functions (compare, equal, equalScalar, larger, largerEq, smaller, smallerEq, unequal) to compare strings by their numeric value they contain instead of alphabetically. This also impacts functions deepEqual, sort, min, max, median, and partitionSelect. Use compareNatural if you need to sort an array with text. See #680.
Angle units

Changed rad, deg, and grad to have short prefixes, and introduced radian, degree, and gradian and their plurals having long prefixes. See #749.
Null
- null is no longer implicitly casted to a number 0, so input like math.add(2, null) is no longer supported. See #830, #353.
- Dropped constant uninitialized, which was used to initialize leave new entries undefined when resizing a matrix is removed. Use undefined instead to indicate entries that are not explicitly set. See #833.
New typed-function library
- The typed-function library used to check the input types of functions is completely rewritten and doesn't use eval under the hood anymore. This means a reduced security risk, and easier to debug code. The API is the same, but error messages may differ a bit. Performance is comparable but may differ in specific use cases and browsers.

Non breaking changes:

Thanks to the new expression compiler and typed-function implementation, mathjs doesn't use JavaScript's eval anymore under the hood. This allows using mathjs in environments with security restrictions. See #401.
Implemented additional methods isUnary() and isBinary() on OperatorNode. See #1025.
Improved error messages for statistical functions.
Upgraded devDependencies.
Fixed #1014: derivative silently dropping additional arguments from operator nodes with more than two arguments.

2018-02-07, version 3.20.2

Upgraded to typed-function@0.10.7 (bug-fix release).
Fixed option implicit not being copied from an OperatorNode when applying function map. Thanks @HarrySarson.
Fixed #995: spaces and underscores not property being escaped in toTex(). Thanks @FSMaxB.

2018-01-17, version 3.20.1

Fixed #1018: simplifyCore failing in some cases with parentheses. Thanks @firepick1.

2018-01-14, version 3.20.0

Implement support for 3 or more arguments for operators + and * in derivative. Thanks @HarrySarson. See #1002.
Fixed simplify evalution of simplify of functions with more than two arguments wrongly: simplify('f(x, y, z)') evaluated to f(f(x, y), z)instead off(x, y, z)`. Thanks @joelhoover.
Fixed simplify throwing an error in some cases when simplifying unknown functions, for example simplify('f(4)'). Thanks @joelhoover.
Fixed #1013: simplify wrongly simplifing some expressions containing unary minus, like 0 - -x. Thanks @joelhoover.
Fixed an error in an example in the documentation of xor. Thanks @denisx.

2018-01-06, version 3.19.0

Extended functions distance and intersect with support for BigNumbers. Thanks @ovk.
Improvements in function simplify: added a rule that allows combining of like terms in embedded quantities. Thanks @joelhoover.

2017-12-28, version 3.18.1

Fixed #998: An issue with simplifying an expression containing a subtraction. Thanks @firepick1.

2017-12-16, version 3.18.0

Implemented function rationalize. Thanks @paulobuchsbaum.

Upgraded dependencies:

decimal.js    7.2.3  →  9.0.1 (no breaking changes affecting mathjs)
fraction.js   4.0.2  →  4.0.4
tiny-emitter  2.0.0  →  2.0.2

Upgraded dev dependencies.
Fixed #975: a wrong example in the docs of lusolve.
Fixed #983: pickRandom returning an array instead of single value when input was an array with just one value. Clarified docs.
Fixed #969: preven issues with yarn autoclean by renaming an interally used folder "docs" to "embeddedDocs".

2017-11-18, version 3.17.0

Improved simplify for nested exponentiations. Thanks @IvanVergiliev.
Fixed a security issue in typed-function allowing arbitrary code execution in the JavaScript engine by creating a typed function with JavaScript code in the name. Thanks Masato Kinugawa.
Fixed a security issue where forbidden properties like constructor could be replaced by using unicode characters when creating an object. No known exploit, but could possibly allow arbitrary code execution. Thanks Masato Kinugawa.

2017-10-18, version 3.16.5

Fixed #954: Functions add and multiply not working when passing three or more arrays or matrices.

2017-10-01, version 3.16.4

Fixed #948, #949: function simplify returning wrong results or running into an infinite recursive loop. Thanks @ericman314.
Fixed many small issues in the embedded docs. Thanks @Schnark.

2017-08-28, version 3.16.3

Fixed #934: Wrong simplification of unary minus. Thanks @firepick1.
Fixed #933: function simplify reordering operations. Thanks @firepick1.
Fixed #930: function isNaN returning wrong result for complex numbers having just one of their parts (re/im) being NaN.
Fixed #929: FibonacciHeap.isEmpty returning wrong result.

2017-08-20, version 3.16.2

Fixed #924: a regression in simplify not accepting the signature simplify(expr, rules, scope) anymore. Thanks @firepick1.
Fixed missing parenthesis when stringifying expressions containing implicit multiplications (see #922). Thanks @FSMaxB.

2017-08-12, version 3.16.1

For security reasons, type checking is now done in a more strict way using functions like isComplex(x) instead of duck type checking like x && x.isComplex === true.
Fixed #915: No access to property "name".
Fixed #901: Simplify units when calling unit.toNumeric(). Thanks @AlexanderBeyn.
Fixed toString of a parsed expression tree containing an immediately invoked function assignment not being wrapped in parenthesis (for example (f(x) = x^2)(4)).

2017-08-06, version 3.16.0

Significant performance improvements in math.simplify. Thanks @firepick1.
Improved API for math.simplify, optionally pass a scope with variables which are resolved, see #907. Thanks @firepick1.
Fixed #912: math.js didn't work on IE10 anymore (regression since 3.15.0).

2017-07-29, version 3.15.0

Added support for the dollar character $ in symbol names (see #895).
Allow objects with prototypes as scope again in the expression parser, this was disabled for security reasons some time ago. See #888, #899. Thanks @ThomasBrierley.
Fixed #846: Issues in the functions map, forEach, and filter when used in the expression parser:
- Not being able to use a function assignment as inline expression for the callback function.
- Not being able to pass an inline expression as callback for map and forEach.
- Index and original array/matrix not passed in map and filter.

2017-07-05, version 3.14.2

Upgraded to fraction.js@4.0.2
Fixed #891 using BigNumbers not working in browser environments.

2017-06-30, version 3.14.1

Reverted to fraction.js@4.0.0, there is an issue with 4.0.1 in the browser.

2017-06-30, version 3.14.0

Implemented set methods setCartesian, setDifference, setDistinct, setIntersect, setIsSubset, setPowerset, setSize. Thanks @Nekomajin42.
Implemented method toHTML on nodes. Thanks @Nekomajin42.
Implemented compareNatural and sort([...], 'natural').
Upgraded dependencies to the latest versions:
- complex.js@2.0.4
- decimal.js@7.2.3
- fraction.js@4.0.1
- tiny-emitter@2.0.0
- And all devDependencies.
Fixed #865: splitUnit can now deal with round-off errors. Thanks @ericman314.
Fixed #876: incorrect definition for unit erg. Thanks @pjhampton.
More informative error message when using single quotes instead of double quotes around a string. Thanks @HarrySarson.

2017-05-27, version 3.13.3

Fixed a bug in function intersection of line and plane. Thanks @viclai.
Fixed security vulnerabilities.

2017-05-26, version 3.13.2

Disabled function chain inside the expression parser for security reasons (it's not needed there anyway).
Fixed #856: function subset not returning non-primitive scalars from Arrays correctly. (like math.eval('arr[1]', {arr: [math.bignumber(2)]}).
Fixed #861: physical constants not available in the expression parser.

2017-05-12, version 3.13.1

Fixed creating units with an alias not working within the expression parser.
Fixed security vulnerabilities. Thanks Sam.

2017-05-12, version 3.13.0

Command line application can now evaluate inline expressions like mathjs 1+2. Thanks @slavaGanzin.
Function derivative now supports abs. Thanks @tetslee.
Function simplify now supports BigNumbers. Thanks @tetslee.
Prevent against endless loops in simplify. Thanks @tetslee.
Fixed #813: function simplify converting small numbers to inexact Fractions. Thanks @tetslee.
Fixed #838: Function simplify now supports constants like e. Thanks @tetslee.

2017-05-05, version 3.12.3

Fixed security vulnerabilities. Thanks Dan and Sam.

2017-04-30, version 3.12.2

Added a rocket trajectory optimization example.

2017-04-24, version 3.12.1

Fixed #804
- Improved handling of powers of Infinity. Thanks @HarrySarson.
- Fixed wrong formatting of complex NaN.
Fixed security vulnerabilities in the expression parser. Thanks Sam and Dan.

2017-04-17, version 3.12.0

Implemented QR decomposition, function math.qr. Thanks @HarrySarson.
Fixed #824: Calling math.random() freezes IE and node.js.

2017-04-08, version 3.11.5

More security measures in the expression parser. WARNING: the behavior of the expression parser is now more strict, some undocumented features may not work any longer.
- Accessing and assigning properties is now only allowed on plain objects, not on classes, arrays, and functions anymore.
- Accessing methods is restricted to a set of known, safe methods.

2017-04-03, version 3.11.4

Fixed a security vulnerability in the expression parser. Thanks @xfix.

2017-04-03, version 3.11.3

Fixed a security vulnerability in the expression parser. Thanks @xfix.

2017-04-03, version 3.11.2

Fixed a security vulnerability in the expression parser. Thanks @xfix.

2017-04-02, version 3.11.1

Fixed security vulnerabilities in the expression parser. Thanks Joe Vennix and @xfix.

2017-04-02, version 3.11.0

Implemented method Unit.toSI() to convert a unit to base SI units. Thanks @ericman314.
Fixed #821, #822: security vulnerabilities in the expression parser. Thanks @comex and @xfix.

2017-03-31, version 3.10.3

More security fixes related to the ones fixed in v3.10.2.

2017-03-31, version 3.10.2

Fixed a security vulnerability in the expression parser allowing execution of arbitrary JavaScript. Thanks @CapacitorSet and @denvit.

2017-03-26, version 3.10.1

Fixed xgcd for negative values. Thanks @litmit.
Fixed #807: function transform of existing functions not being removed when overriding such a function.

2017-03-05, version 3.10.0

Implemented function reshape. Thanks @patgrasso and @ericman314.
Implemented configuration option seedRandom for deterministic random numbers. Thanks @morsecodist.
Small fixes in the docs. Thanks @HarrySarson.
Dropped support for component package manager (which became deprecated about one and a half year ago).

2017-02-22, version 3.9.3

Fixed #797: issue with production builds of React Native projects.
Fixed math.round not accepting inputs NaN, Infinity, -Infinity.
Upgraded all dependencies.

2017-02-16, version 3.9.2

Fixed #795: Parse error in case of a multi-line expression with just comments.

2017-02-06, version 3.9.1

Fixed #789: Math.js not supporting conversion of string to BigNumber, Fraction, or Complex number.
Fixed #790: Expression parser did not pass function arguments of enclosing functions via scope to functions having rawArgs = true.
Small fixes in the docs. Thanks @HarrySarson.

2017-01-23, version 3.9.0

Implemented support for algebra: powerful new functions simplify and derivative. Thanks @ericman314, @tetslee, and @BigFav.
Implemented Kronecker Product kron. Thanks @adamisntdead.
Reverted FunctionNode not accepting a string as function name anymore.
Fixed #765: FunctionAssignmentNode.toString() returning a string incompatible with the function assignment syntax.

2016-12-15, version 3.8.1

Implemented function mad (median absolute deviation). Thanks @ruhleder.
Fixed #762: expression parser failing to invoke a function returned by a function.

2016-11-18, version 3.8.0

Functions add and multiply now accept more than two arguments. See #739.
OperatorNode now supports more than two arguments. See #739. Thanks @FSMaxB.
Implemented a method Node.cloneDeep for the expression nodes. See #745.
Fixed a bug in Node.clone() not cloning implicit multiplication correctly. Thanks @FSMaxB.
Fixed #737: Improved algorithm determining the best prefix for units. It will now retain the original unit like 1 cm when close enough, instead of returning 10 mm. Thanks @ericman314.
Fixed #732: Allow letter-like unicode characters like Ohm \u2126.
Fixed #749: Units rad, deg, and grad can now have prefixes like millirad.
Some fixes in the docs and comments of examples. Thanks @HarrySarson.

2016-11-05, version 3.7.0

Implemented method Node.equals(other) for all nodes of the expression parser.
Implemented BigNumber support in function arg().
Command Line Interface loads faster.
Implicit conversions between Fractions and BigNumbers throw a neat error now (See #710).

2016-10-21, version 3.6.0

Implemented function erf(). THanks @patgrasso.
Extended function cross() to support n-d vectors. Thanks @patgrasso.
Extended function pickRandom with the option to pick multiple values from an array and give the values weights: pickRandom(possibles, number, weights). Thanks @woylie.
Parser now exposes test functions like isAlpha which can be replaced in order to adjust the allowed characters in variables names (See #715).
Fixed #727: Parser not throwing an error for invalid implicit multiplications like -2 2 and 2^3 4 (right after the second value of an operator).
Fixed #688: Describe allowed variable names in the docs.

2016-09-21, version 3.5.3

Some more fixes regarding numbers ending with a decimal mark (like 2.).

2016-09-20, version 3.5.2

Fixed numbers ending with a decimal mark (like 2.) not being supported by the parser, solved the underlying ambiguity in the parser. See #707, #711.

2016-09-12, version 3.5.1

Removed a left over console.log statement. Thanks @eknkc.

2016-09-07, version 3.5.0

Comments of expressions are are now stored in the parsed nodes. See #690.
Fixed function print not accepting an Object with formatting options as third parameter Thanks @ThomasBrierley.
Fixed #707: The expression parser no longer accepts numbers ending with a dot like 2..

2016-08-08, version 3.4.1

Fixed broken bundle files (dist/math.js, dist/math.min.js).
Fixed some layout issues in the function reference docs.

2016-08-07, version 3.4.0

Implemented support for custom units using createUnit. Thanks @ericman314.
Implemented function splitUnits. Thanks @ericman314.
Implemented function isPrime. Thanks @MathBunny.

2016-07-05, version 3.3.0

Implemented function isNaN.
Function math.filter now passes three arguments to the callback function: value, index, and array.
Removed the check on the number of arguments from functions defined in the expression parser (see #665).
Fixed #665: functions map, forEach, and filter now invoke callbacks which are a typed-function with the correct number of arguments.

2016-04-26, version 3.2.1

Fixed #651: unable to perform calculations on "Unit-less" units.
Fixed matrix.subset mutating the replacement matrix when unsqueezing it.

2016-04-16, version 3.2.0

Implemented #644: method Parser.getAll() to retrieve all defined variables.
Upgraded dependencies (decimal.js@5.0.8, fraction.js@3.3.1, typed-function@0.10.4).
Fixed #601: Issue with unnamed typed-functions by upgrading to typed-function v0.10.4.
Fixed #636: More strict toTex templates, reckon with number of arguments.
Fixed #641: Bug in expression parser parsing implicit multiplication with wrong precedence in specific cases.
Fixed #645: Added documentation about engineering notation of function math.format.

2016-04-03, version 3.1.4

Using ES6 Math functions like Math.sinh, Math.cbrt, Math.sign, etc when available.
Fixed #631: unit aliases weeks, months, and years where missing.
Fixed #632: problem with escaped backslashes at the end of strings.
Fixed #635: Node.toString options where not passed to function arguments.
Fixed #629: expression parser throws an error when passing a number with decimal exponent instead of parsing them as implicit multiplication.
Fixed #484, #555: inaccuracy of math.sinh for values between -1 and 1.
Fixed #625: Unit in (inch) not always working due to ambiguity with the operator a in b (alias of a to b).

2016-03-24, version 3.1.3

Fix broken bundle.

2016-03-24, version 3.1.2

Fix broken npm release.

2016-03-24, version 3.1.1

Fixed #621: a bug in parsing implicit multiplications like (2)(3)+4.
Fixed #623: nthRoot of zero with a negative root returned 0 instead of Infinity.
Throw an error when functions min, max, mean, or median are invoked with multiple matrices as arguments (see #598).

2016-03-19, version 3.1.0

Hide multiplication operator by default when outputting toTex and toString for implicit multiplications. Implemented and option to output the operator.
Implemented unit kip and alias kips. Thanks @hgupta9.
Added support for prefixes for units mol and mole. Thanks @stu-blair.
Restored support for implicit multiplications like 2(3+4) and (2+3)(4+5).
Some improvements in the docs.
Added automatic conversions from boolean and null to Fraction, and conversions from Fraction to Complex.

2016-03-04, version 3.0.0

breaking changes

More restricted support for implicit multiplication in the expression parser: (...)(...) is now evaluated as a function invocation, and [...][...] as a matrix subset.
Matrix multiplication no longer squeezes scalar outputs to a scalar value, but leaves them as they are: a vector or matrix containing a single value. See #529.
Assignments in the expression parser now return the assigned value rather than the created or updated object (see #533). Example:
```
A = eye(3)
A[1,1] = 2   # this assignment now returns 2 instead of A
```
Expression parser now supports objects. This involves a refactoring and extension in expression nodes:
- Implemented new node ObjectNode.
- Refactored AssignmentNode, UpdateNode, and IndexNode are refactored into AccessorNode, AssignmentNode, and IndexNode having a different API.
Upgraded the used BigNumber library decimal.js to v5. Replaced the trigonometric functions of math.js with those provided in decimal.js v5. This can give slightly different behavior qua round-off errors.
Replaced the internal Complex.js class with the complex.js library created by @infusion.
Entries in a matrix (typically numbers, BigNumbers, Units, etc) are now considered immutable, they are no longer copied when performing operations on the entries, improving performance.
Implemented nearly equal comparison for relational functions (equal, larger, smaller, etc.) when using BigNumbers.
Changed the casing of the configuration options matrix (Array or Matrix) and number (number, BigNumber, Fraction) such that they now match the type returned by math.typeof. Wrong casing gives a console warning but will still work.
Changed the default config value for epsilon from 1e-14 to 1e-12, see #561.

non-breaking changes

Extended function pow to return the real root for cubic roots of negative numbers. See #525, #482, #567.
Implemented support for JSON objects in the expression parser and the function math.format.
Function math.fraction now supports BigNumber, and function math.bignumber now supports Fraction.
Expression parser now allows function and/or variable assignments inside accessors and conditionals, like A[x=2] or a > 2 ? b="ok" : b="fail".
Command line interface:
- Outputs the variable name of assignments.
- Fixed not rounding BigNumbers to 14 digits like numbers.
- Fixed non-working autocompletion of user defined variables.
Reorganized and extended docs, added docs on classes and more. Thanks @hgupta9.
Added new units acre, hectare, torr, bar, mmHg, mmH2O, cmH2O, and added new aliases acres, hectares, sqfeet, sqyard, sqmile, sqmiles, mmhg, mmh2o, cmh2o. Thanks @hgupta9.
Fixed a bug in the toString method of an IndexNode.
Fixed angle units deg, rad, grad, cycle, arcsec, and arcmin not being defined as BigNumbers when configuring to use BigNumbers.

2016-02-03, version 2.7.0

Added more unit aliases for time: secs, mins, hr, hrs. See #551.
Added support for doing operations with mixed Fractions and BigNumbers.
Fixed #540: math.intersect() returning null in some cases. Thanks @void42.
Fixed #546: Cannot import BigNumber, Fraction, Matrix, Array. Thanks @brettjurgens.

2016-01-08, version 2.6.0

Implemented (complex) units VA and VAR.
Implemented time units for weeks, months, years, decades, centuries, and millennia. Thanks @owenversteeg.
Implemented new notation engineering in function math.format. Thanks @johnmarinelli.
Fixed #523: In some circumstances, matrix subset returned a scalar instead of the correct subset.
Fixed #536: A bug in an internal method used for sparse matrices.

2015-12-05, version 2.5.0

Implemented support for numeric types Fraction and BigNumber in units.
Implemented new method toNumeric for units.
Implemented new units arcsec, arcsecond, arcmin, arcminute. Thanks @devdevdata222.
Implemented new unit Herts (Hz). Thanks @SwamWithTurtles.
Fixed #485: Scoping issue with variables both used globally as well as in a function definition.
Fixed: Function number didn't support Fraction as input.

2015-11-14, version 2.4.2

Fixed #502: Issue with format in some JavaScript engines.
Fixed #503: Removed trailing commas and the use of keyword import as property, as this gives issues with old JavaScript engines.

2015-10-29, version 2.4.1

Fixed #480: nthRoot not working on Internet Explorer (up to IE11).
Fixed #490: nthRoot returning an error for negative values like nthRoot(-2, 3).
Fixed #489: an issue with initializing a sparse matrix without data. Thanks @Retsam.
Fixed: #493: function combinations did not throw an exception for non-integer values of k.
Fixed: function import did not override typed functions when the option override was set true.
Fixed: added functions math.sparse and math.index to the reference docs, they where missing.
Fixed: removed memoization from gamma and factorial functions, this could blow up memory.

2015-10-09, version 2.4.0

Added support in the expression parser for mathematical alphanumeric symbols in the expression parser: unicode range \u{1D400} to \u{1D7FF} excluding invalid code points.
Extended function distance with more signatures. Thanks @kv-kunalvyas.
Fixed a bug in functions sin and cos, which gave wrong results for BigNumber integer values around multiples of tau (i.e. sin(bignumber(7))).
Fixed value of unit stone. Thanks @Esvandiary for finding the error.

2015-09-19, version 2.3.0

Implemented function distance. Thanks @devanp92.
Implemented support for Fractions in function lcm. Thanks @infusion.
Implemented function cbrt for numbers, complex numbers, BigNumbers, Units.
Implemented function hypot.
Upgraded to fraction.js v3.0.0.
Fixed #450: issue with non sorted index in sparse matrices.
Fixed #463, #322: inconsistent handling of implicit multiplication.
Fixed #444: factorial of infinity not returning infinity.

2015-08-30, version 2.2.0

Units with powers (like m^2 and s^-1) now output with the best prefix.
Implemented support for units to abs, cube, sign, sqrt, square. Thanks @ericman314.
Implemented function catalan (Combinatorics). Thanks @devanp92.
Improved the canDefineProperty check to return false in case of IE8, which has a broken implementation of defineProperty. Thanks @golmansax.
Fixed function to not working in case of a simplified unit.
Fixed #437: an issue with row swapping in lup, also affecting lusolve.

2015-08-12, version 2.1.1

Fixed wrong values of the physical constants speedOfLight, molarMassC12, and magneticFluxQuantum. Thanks @ericman314 for finding two of them.

2015-08-11, version 2.1.0

Implemented derived units (like 110 km/h in m/s). Thanks @ericman314.
Implemented support for electric units. Thanks @ericman314.
Implemented about 50 physical constants like speedOfLight, gravity, etc.
Implemented function kldivergence (Kullback-Leibler divergence). Thanks @saromanov.
Implemented function mode. Thanks @kv-kunalvyas.
Added support for unicode characters in the expression parser: greek letters and latin letters with accents. See #265.
Internal functions Unit.parse and Complex.parse now throw an Error instead of returning null when passing invalid input.

2015-07-29, version 2.0.1

Fixed operations with mixed fractions and numbers be converted to numbers instead of fractions.

2015-07-28, version 2.0.0

Large internal refactoring:
- performance improvements.
- allows to create custom bundles
- functions are composed using typed-function and are extensible
Implemented support for fractions, powered by the library fraction.js.
Implemented matrix LU decomposition with partial pivoting and a LU based linear equations solver (functions lup and lusolve). Thanks @rjbaucells.
Implemented a new configuration option predictable, which can be set to true in order to ensure predictable function output types.
Implemented function intersect. Thanks @kv-kunalvyas.
Implemented support for adding toTex properties to custom functions. Thanks @FSMaxB.
Implemented support for complex values to nthRoot. Thanks @gangachris.
Implemented util functions isInteger, isNegative, isNumeric, isPositive, and isZero.

breaking changes

String input is now converted to numbers by default for all functions.
Adding two strings will no longer concatenate them, but will convert the strings to numbers and add them.
Function index does no longer accept an array [start, end, step], but instead accepts an array with arbitrary index values. It also accepts a Range object as input.
Function typeof no longer returns lower case names, but now returns lower case names for primitives (like number, boolean, string), and upper-camel-case for non-primitives (like Array, Complex, Function).
Function import no longer supports a module name as argument. Instead, modules can be loaded using require: math.import(require('module-name')).
Function import has a new option silent to ignore errors, and throws errors on duplicates by default.
Method Node.compile() no longer needs math to be passed as argument.
Reintroduced method Node.eval([scope]).
Function sum now returns zero when input is an empty array. Thanks @FSMAxB.
The size of Arrays is no longer validated. Matrices will validate this on creation.

2015-07-12, version 1.7.1

Fixed #397: Inaccuracies in nthRoot for very large values, and wrong results for very small values. (backported from v2)
Fixed #405: Parser throws error when defining a function in a multiline expression.

2015-05-31, version 1.7.0

Implemented function quantileSeq and partitionSelect. Thanks @BigFav.
Implemented functions stirlingS2, bellNumbers, composition, and multinomial. Thanks @devanp92.
Improved the performance of median (see #373). Thanks @BigFav.
Extended the command line interface with a mode option to output either the expressions result, string representation, or tex representation. Thanks @FSMaxB.
Fixed #309: Function median mutating the input matrix. Thanks @FSMaxB.
Fixed Node.transform not recursing over replaced parts of the node tree (see #349).
Fixed #381: issue in docs of randomInt.

2015-04-22, version 1.6.0

Improvements in toTex. Thanks @FSMaxB.
Fixed #328: abs(0 + 0i) evaluated to NaN.
Fixed not being able to override lazy loaded constants.

2015-04-09, version 1.5.2

Fixed #313: parsed functions did not handle recursive calls correctly.
Fixed #251: binary prefix and SI prefix incorrectly used for byte. Now following SI standards (1 KiB == 1024 B, 1 kB == 1000 B).
Performance improvements in parsed functions.

2015-04-08, version 1.5.1

Fixed #316: a bug in rounding values when formatting.
Fixed #317, #319: a bug in formatting negative values.

2015-03-28, version 1.5.0

Added unit stone (6.35 kg).
Implemented support for sparse matrices. Thanks @rjbaucells.
Implemented BigNumber support for function atan2. Thanks @BigFav.
Implemented support for custom LaTeX representations. Thanks @FSMaxB.
Improvements and bug fixes in outputting parentheses in Node.toString and Node.toTex functions. Thanks @FSMaxB.
Fixed #291: function format sometimes returning exponential notation when it should return a fixed notation.

2015-02-28, version 1.4.0

Implemented trigonometric functions: acosh, acoth, acsch, asech, asinh, atanh, acot, acsc, asec. Thanks @BigFav.
Added BigNumber support for functions: cot, csc, sec, coth, csch, sech. Thanks @BigFav.
Implemented support for serialization and deserialization of math.js data types.
Fixed the calculation of norm() and abs() for large complex numbers. Thanks @rjbaucells.
Fixed #281: improved formatting complex numbers. Round the real or imaginary part to zero when the difference is larger than the configured precision.

2015-02-09, version 1.3.0

Implemented BigNumber implementations of most trigonometric functions: sin, cos, tan, asin, acos, atan, cosh, sinh, tanh. Thanks @BigFav.
Implemented function trace. Thanks @pcorey.
Faster loading of BigNumber configuration with a high precision by lazy loading constants like pi and e.
Fixed constants NaN and Infinity not being BigNumber objects when BigNumbers are configured.
Fixed missing parentheses in the toTex representation of function permutations.
Some minor fixes in the docs. Thanks @KenanY.

2014-12-25, version 1.2.0

Support for bitwise operations bitAnd, bitNot, bitOr, bitXor, leftShift, rightArithShift, and rightLogShift. Thanks @BigFav.
Support for boolean operations and, not, or, xor. Thanks @BigFav.
Support for gamma function. Thanks @BigFav.
Converting a unit without value will now result in a unit with value, i.e. inch in cm will return 2.54 cm instead of cm.
Improved accuracy of sinh and complex cos and sin. Thanks @pavpanchekha.
Renamed function select to chain. The old function select will remain functional until math.js v2.0.
Upgraded to decimal.js v4.0.1 (BigNumber library).

2014-11-22, version 1.1.1

Fixed Unit divided by Number returning zero.
Fixed BigNumber downgrading to Number for a negative base in pow.
Fixed some typos in error messaging (thanks @andy0130tw) and docs.

2014-11-15, version 1.1.0

Implemented functions dot (dot product), cross (cross product), and nthRoot.
Officially opened up the API of expression trees:
- Documented the API.
- Implemented recursive functions clone, map, forEach, traverse, transform, and filter for expression trees.
- Parameter index in the callbacks of map and forEach are now cloned for every callback.
- Some internal refactoring inside nodes to make the API consistent:
  - Renamed params to args and vice versa to make things consistent.
  - Renamed Block.nodes to Block.blocks.
  - FunctionNode now has a name: string instead of a symbol: SymbolNode.
  - Changed constructor of RangeNode to new RangeNode(start: Node, end: Node [, step: Node]).
  - Nodes for a BlockNode must now be passed via the constructor instead of via a function add.
Fixed 2e giving a syntax error instead of being parsed as 2 * e.

2014-09-12, version 1.0.1

Disabled array notation for ranges in a matrix index in the expression parser (it is confusing and redundant there).
Fixed a regression in the build of function subset not being able to return a scalar.
Fixed some missing docs and broken links in the docs.

2014-09-04, version 1.0.0

Implemented a function filter(x, test).
Removed math.distribution for now, needs some rethinking.
math.number can convert units to numbers (requires a second argument)
Fixed some precedence issues with the range and conversion operators.
Fixed an zero-based issue when getting a matrix subset using an index containing a matrix.

2014-08-21, version 0.27.0

Implemented functions sort(x [, compare]) and flatten(x).
Implemented support for null in all functions.
Implemented support for "rawArgs" functions in the expression parser. Raw functions are invoked with unevaluated parameters (nodes).
Expressions in the expression parser can now be spread over multiple lines, like '2 +\n3'.
Changed default value of the option wrap of function math.import to false.
Changed the default value for new entries in a resized matrix when to zero. To leave new entries uninitialized, use the new constant math.uninitialized as default value.
Renamed transform property from __transform__ to transform, and documented the transform feature.
Fixed a bug in math.import not applying options when passing a module name.
A returned matrix subset is now only squeezed when the index consists of scalar values, and no longer for ranges resolving into a single value.

2014-08-03, version 0.26.0

A new instance of math.js can no longer be created like math([options]), to prevent side effects from math being a function instead of an object. Instead, use the function math.create([options]) to create a new instance.
Implemented BigNumber support for all constants: pi, tau, e, phi, E, LN2, LN10, LOG2E, LOG10E, PI, SQRT1_2, and SQRT2.
Implemented BigNumber support for functions gcd, xgcd, and lcm.
Fixed function gxcd returning an Array when math.js was configured as {matrix: 'matrix'}.
Multi-line expressions now return a ResultSet instead of an Array.
Implemented transforms (used right now to transform one-based indices to zero-based for expressions).
When used inside the expression parser, functions concat, min, max, and mean expect an one-based dimension number.
Functions map and forEach invoke the callback with one-based indices when used from within the expression parser.
When adding or removing dimensions when resizing a matrix, the dimensions are added/removed from the inner side (right) instead of outer side (left).
Improved index out of range errors.
Fixed function concat not accepting a BigNumber for parameter dim.
Function squeeze now squeezes both inner and outer singleton dimensions.
Output of getting a matrix subset is not automatically squeezed anymore except for scalar output.
Renamed FunctionNode to FunctionAssignmentNode, and renamed ParamsNode to FunctionNode for more clarity.
Fixed broken auto completion in CLI.
Some minor fixes.

2014-07-01, version 0.25.0

The library now immediately returns a default instance of mathjs, there is no need to instantiate math.js in a separate step unless one ones to set configuration options:

  // instead of:
  var mathjs = require('mathjs'),  // load math.js
      math = mathjs();             // create an instance

  // just do:
  var math = require('mathjs');

Implemented support for implicit multiplication, like math.eval('2a', {a:3}) and math.eval('(2+3)(1-3)'). This changes behavior of matrix indexes as well: an expression like [...][...] is not evaluated as taking a subset of the first matrix, but as an implicit multiplication of two matrices.
Removed utility function ifElse. This function is redundant now the expression parser has a conditional operator a ? b : c.
Fixed a bug with multiplying a number with a temperature, like math.eval('10 * celsius').
Fixed a bug with symbols having value undefined not being evaluated.

2014-06-20, version 0.24.1

Something went wrong with publishing on npm.

2014-06-20, version 0.24.0

Added constant null.
Functions equal and unequal support null and undefined now.
Function typeof now recognizes regular expressions as well.
Objects Complex, Unit, and Help now return their string representation when calling .valueOf().
Changed the default number of significant digits for BigNumbers from 20 to 64.
Changed the behavior of the conditional operator (a ? b : c) to lazy evaluating.
Fixed imported, wrapped functions not accepting null and undefined as function arguments.

2014-06-10, version 0.23.0

Renamed some functions (everything now has a logical, camel case name):
- Renamed functions edivide, emultiply, and epow to dotDivide, dotMultiply, and dotPow respectively.
- Renamed functions smallereq and largereq to smallerEq and largerEq.
- Renamed function unary to unaryMinus and added support for strings.
end is now a reserved keyword which cannot be used as function or symbol name in the expression parser, and is not allowed in the scope against which an expression is evaluated.
Implemented function unaryPlus and unary plus operator.
Implemented function deepEqual for matrix comparisons.
Added constant phi, the golden ratio (phi = 1.618...).
Added constant version, returning the version number of math.js as string.
Added unit drop (gtt).
Fixed not being able to load math.js using AMD/require.js.
Changed signature of math.parse(expr, nodes) to math.parse(expr, options) where options: {nodes: Object.<String, Node>}
Removed matrix support from conditional function ifElse.
Removed automatic assignment of expression results to variable ans. This functionality can be restored by pre- or postprocessing every evaluation, something like:
```
  function evalWithAns (expr, scope) {
    var ans = math.eval(expr, scope);
    if (scope) {
      scope.ans = ans;
    }
    return ans;
  }
```

2014-05-22, version 0.22.0

Implemented support to export expressions to LaTeX. Thanks Niels Heisterkamp (@nheisterkamp).
Output of matrix multiplication is now consistently squeezed.
Added reference documentation in the section /docs/reference.
Fixed a bug in multiplying units without value with a number (like 5 * cm).
Fixed a bug in multiplying two matrices containing vectors (worked fine for arrays).
Fixed random functions not accepting Matrix as input, and always returning a Matrix as output.

2014-05-13, version 0.21.1

Removed crypto library from the bundle.
Deprecated functions Parser.parse and Parser.compile. Use math.parse and math.compile instead.
Fixed function add not adding strings and matrices element wise.
Fixed parser not being able to evaluate an exponent followed by a unary minus like 2^-3, and a transpose followed by an index like [3]'[1].

2014-04-24, version 0.21.0

Implemented trigonometric hyperbolic functions cosh, coth, csch, sech, sinh, tanh. Thanks Rogelio J. Baucells (@rjbaucells).
Added property type to all expression nodes in an expression tree.
Fixed functions log, log10, pow, and sqrt not supporting complex results from BigNumber input (like sqrt(bignumber(-4))).

2014-04-16, version 0.20.0

Switched to module decimal.js for BigNumber support, instead of bignumber.js.
Implemented support for polar coordinates to the Complex datatype. Thanks Finn Pauls (@finnp).
Implemented BigNumber support for functions exp, log, and log10.
Implemented conditional operator a ? b : c in expression parser.
Improved floating point comparison: the functions now check whether values are nearly equal, against a configured maximum relative difference epsilon. Thanks Rogelio J. Baucells (@rjbaucells).
Implemented function norm. Thanks Rogelio J. Baucells (@rjbaucells).
Improved function ifElse, is now specified for special data types too.
Improved function det. Thanks Bryan Cuccioli (@bcuccioli).
Implemented BigNumber support for functions det and diag.
Added unit alias lbs (pound mass).
Changed configuration option decimals to precision (applies to BigNumbers only).
Fixed support for element-wise comparisons between a string and a matrix.
Fixed: expression parser now trows IndexErrors with one-based indices instead of zero-based.
Minor bug fixes.

2014-03-30, version 0.19.0

Implemented functions compare, sum, prod, var, std, median.
Implemented function ifElse Thanks @mtraynham.
Minor bug fixes.

2014-02-15, version 0.18.1

Added unit feet.
Implemented function compile (shortcut for parsing and then compiling).
Improved performance of function pow for matrices. Thanks @hamadu.
Fixed broken auto completion in the command line interface.
Fixed an error in function combinations for large numbers, and improved performance of both functions combinations and permutations.

2014-01-18, version 0.18.0

Changed matrix index notation of expression parser from round brackets to square brackets, for example A[1, 1:3] instead of A(1, 1:3).
Removed need to use the function keyword for function assignments in the expression parser, you can define a function now like f(x) = x^2.
Implemented a compilation step in the expression parser: expressions are compiled into JavaScript, giving much better performance (easily 10x as fast).
Renamed unit conversion function and operator in to to. Operator in is still available in the expression parser as an alias for to. Added unit in, an abbreviation for inch. Thanks Elijah Insua (@tmpvar).
Added plurals and aliases for units.
Implemented an argument includeEnd for function range (false by default).
Ranges in the expression parser now support big numbers.
Implemented functions permutations and combinations. Thanks Daniel Levin (@daniel-levin).
Added lower case abbreviation l for unit litre.

2013-12-19, version 0.17.1

Fixed a bug with negative temperatures.
Fixed a bug with prefixes of units squared meter m2 and cubic meter m3.

2013-12-12, version 0.17.0

Renamed and flattened configuration settings:
- number.defaultType is now number.
- number.precision is now decimals.
- matrix.defaultType is now matrix.
Function multiply now consistently outputs a complex number on complex input.
Fixed mod and in not working as function (only as operator).
Fixed support for old browsers (IE8 and older), compatible when using es5-shim.
Fixed support for Java's ScriptEngine.

2013-11-28, version 0.16.0

Implemented BigNumber support for arbitrary precision calculations. Added settings number.defaultType and number.precision to configure big numbers.
Documentation is extended.
Removed utility functions isScalar, toScalar, isVector, toVector from Matrix and Range. Use math.squeeze and math.size instead.
Implemented functions get and set on Matrix, for easier and faster retrieval/replacement of elements in a matrix.
Implemented function resize, handling matrices, scalars, and strings.
Functions ones and zeros now return an empty matrix instead of a number 1 or 0 when no arguments are provided.
Implemented functions min and max for Range and Index.
Resizing matrices now leaves new elements undefined by default instead of filling them with zeros. Function resize now has an extra optional parameter defaultValue.
Range operator : in expression parser has been given a higher precedence.
Functions don't allow arguments of unknown type anymore.
Options be set when constructing a math.js instance or using the new function config(options. Options are no longer accessible via math.options.
Renamed scientific notation to exponential in function format.
Function format outputs exponential notation with positive exponents now always with + sign, so outputs 2.1e+3 instead of 2.1e3.
Fixed function squeeze not being able squeeze into a scalar.
Some fixes and performance improvements in the resize and subset functions.
Function size now adheres to the option matrix.defaultType for scalar input.
Minor bug fixes.

2013-10-26, version 0.15.0

Math.js must be instantiated now, static calls are no longer supported. Usage:
- node.js: var math = require('mathjs')();
- browser: var math = mathjs();
Implemented support for multiplying vectors with matrices.
Improved number formatting:
- Function format now support various options: precision, different notations (fixed, scientific, auto), and more.
- Numbers are no longer rounded to 5 digits by default when formatted.
- Implemented a function format for Matrix, Complex, Unit, Range, and Selector to format using options.
- Function format does only stringify values now, and has a new parameter precision to round to a specific number of digits.
- Removed option math.options.precision, use math.format(value [, precision]) instead.
- Fixed formatting numbers as scientific notation in some cases returning a zero digit left from the decimal point. (like "0.33333e8" rather than "3.3333e7"). Thanks @husayt.
Implemented a function print to interpolate values in a template string, this functionality was moved from the function format.
Implemented statistics function mean. Thanks Guillermo Indalecio Fernandez (@guillermobox).
Extended and changed max and min for multi dimensional matrices: they now return the maximum and minimum of the flattened array. An optional second argument dim allows to calculate the max or min for specified dimension.
Renamed option math.options.matrix.default to math.options.matrix.defaultType.
Removed support for comparing complex numbers in functions smaller, smallereq, larger, largereq. Complex numbers cannot be ordered.

2013-10-08, version 0.14.0

Introduced an option math.options.matrix.default which can have values matrix (default) or array. This option is used by the functions eye, ones, range, and zeros, to determine the type of matrix output.
Getting a subset of a matrix will automatically squeeze the resulting subset, setting a subset of a matrix will automatically unsqueeze the given subset.
Removed concatenation of nested arrays in the expression parser. You can now input nested arrays like in JavaScript. Matrices can be concatenated using the function concat.
The matrix syntax [...] in the expression parser now creates 1 dimensional matrices by default. math.eval('[1,2,3,4]') returns a matrix with size [4], math.eval('[1,2;3,4]') returns a matrix with size [2,2].
Documentation is restructured and extended.
Fixed non working operator mod (modulus operator).

2013-09-03, version 0.13.0

Implemented support for booleans in all relevant functions.
Implemented functions map and forEach. Thanks Sebastien Piquemal (@sebpic).
All construction functions can be used to convert the type of variables, also element-wise for all elements in an Array or Matrix.
Changed matrix indexes of the expression parser to one-based with the upper-bound included, similar to most math applications. Note that on a JavaScript level, math.js uses zero-based indexes with excluded upper-bound.
Removed support for scalars in the function subset, it now only supports Array, Matrix, and String.
Removed the functions get and set from a selector, they are a duplicate of the function subset.
Replaced functions get and set of Matrix with a single function subset.
Some moving around with code and namespaces:
- Renamed namespace math.expr to math.expression (contains Scope, Parser, node objects).
- Renamed namespace math.docs to math.expression.docs.
- Moved math.expr.Selector to math.chaining.Selector.
Fixed some edge cases in functions lcm and xgcd.

2013-08-22, version 0.12.1

Fixed outdated version of README.md.
Fixed a broken unit test.

2013-08-22, version 0.12.0

Implemented functions random([min, max]), randomInt([min, max]), pickRandom(array). Thanks Sebastien Piquemal (@sebpic).
Implemented function distribution(name), generating a distribution object with functions random, randomInt, pickRandom for different distributions. Currently supporting uniform and normal.
Changed the behavior of range to exclude the upper bound, so range(1, 4) now returns [1, 2, 3] instead of [1, 2, 3, 4].
Changed the syntax of range, which is now range(start, end [, step]) instead of range(start, [step, ] end).
Changed the behavior of ones and zeros to geometric dimensions, for example ones(3) returns a vector with length 3, filled with ones, and ones(3,3) returns a 2D array with size [3, 3].
Changed the return type of ones and zeros: they now return an Array when arguments are Numbers or an Array, and returns a Matrix when the argument is a Matrix.
Change matrix index notation in parser from round brackets to square brackets, for example A[0, 0:3].
Removed the feature introduced in v0.10.0 to automatically convert a complex value with an imaginary part equal to zero to a number.
Fixed zeros being formatted as null. Thanks @TimKraft.

2013-07-23, version 0.11.1

Fixed missing development dependency

2013-07-23, version 0.11.0

Changed math.js from one-based to zero-based indexes.
- Getting and setting matrix subset is now zero-based.
- The dimension argument in function concat is now zero-based.
Improvements in the string output of function help.
Added constants true and false.
Added constructor function boolean.
Fixed function select not accepting 0 as input. Thanks Elijah Manor (@elijahmanor).
Parser now supports multiple unary minus operators after each other.
Fixed not accepting empty matrices like [[], []].
Some fixes in the end user documentation.

2013-07-08, version 0.10.0

For complex calculations, all functions now automatically replace results having an imaginary part of zero with a Number. (2i * 2i now returns a Number -4 instead of a Complex -4 + 0i).
Implemented support for injecting custom node handlers in the parser. Can be used for example to implement a node handler for plotting a graph.
Implemented end user documentation and a new help function.
Functions size and squeeze now return a Matrix instead of an Array as output on Matrix input.
Added a constant tau (2 * pi). Thanks Zak Zibrat (@palimpsests).
Renamed function unaryminus to unary.
Fixed a bug in determining node dependencies in function assignments.

2013-06-14, version 0.9.1

Implemented element-wise functions and operators: emultiply (x .* y), edivide (x ./ y), epow (x .^ y).
Added constants Infinity and NaN.
Removed support for Workspace to keep the library focused on its core task.
Fixed a bug in the Complex constructor, not accepting NaN values.
Fixed division by zero in case of pure complex values.
Fixed a bug in function multiply multiplying a pure complex value with Infinity.

2013-05-29, version 0.9.0

Implemented function math.parse(expr [,scope]). Optional parameter scope can be a plain JavaScript Object containing variables.
Extended function math.expr(expr [, scope]) with an additional parameter scope, similar to parse. Example: math.eval('x^a', {x:3, a:2});.
Implemented function subset, to get or set a subset from a matrix, string, or other data types.
Implemented construction functions number and string (mainly useful inside the parser).
Improved function det. Thanks Bryan Cuccioli (@bcuccioli).
Moved the parse code from prototype math.expr.Parser to function math.parse, simplified Parser a little bit.
Strongly simplified the code of Scope and Workspace.
Fixed function mod for negative numerators, and added error messages in case of wrong input.

2013-05-18, version 0.8.2

Extended the import function and some other minor improvements.
Fixed a bug in merging one dimensional vectors into a matrix.
Fixed a bug in function subtract, when subtracting a complex number from a real number.

2013-05-10, version 0.8.1

Fixed an npm warning when installing mathjs globally.

2013-05-10, version 0.8.0

Implemented a command line interface. When math.js is installed globally via npm, the application is available on your system as 'mathjs'.
Implemented end keyword for index operator, and added support for implicit start and end (expressions like a(2,:) and b(2:end,3:end-1) are supported now).
Function math.eval is more flexible now: it supports variables and multi-line expressions.
Removed the read-only option from Parser and Scope.
Fixed non-working unequal operator != in the parser.
Fixed a bug in resizing matrices when replacing a subset.
Fixed a bug in updating a subset of a non-existing variable.
Minor bug fixes.

2013-05-04, version 0.7.2

Fixed method unequal, which was checking for equality instead of inequality. Thanks @FJS2.

2013-04-27, version 0.7.1

Improvements in the parser:
- Added support for chained arguments.
- Added support for chained variable assignments.
- Added a function remove(name) to remove a variable from the parsers scope.
- Renamed nodes for more consistency and to resolve naming conflicts.
- Improved stringification of an expression tree.
- Some simplifications in the code.
- Minor bug fixes.
Fixed a bug in the parser, returning NaN instead of throwing an error for a number with multiple decimal separators like 2.3.4.
Fixed a bug in Workspace.insertAfter.
Fixed: math.js now works on IE 6-8 too.

2013-04-20, version 0.7.0

Implemented method math.eval, which uses a readonly parser to evaluate expressions.
Implemented method xgcd (extended eucledian algorithm). Thanks Bart Kiers (@bkiers).
Improved math.format, which now rounds values to a maximum number of digits instead of decimals (default is 5 digits, for example math.format(math.pi) returns 3.1416).
Added examples.
Changed methods square and cube to evaluate matrices element wise (consistent with all other methods).
Changed second parameter of method import to an object with options.
Fixed method math.typeof on IE.
Minor bug fixes and improvements.

2013-04-13, version 0.6.0

Implemented chained operations via method math.select(). For example math.select(3).add(4).subtract(2).done() will return 5.
Implemented methods gcd and lcm.
Implemented method Unit.in(unit), which creates a clone of the unit with a fixed representation. For example math.unit('5.08 cm').in('inch') will return a unit which string representation always is in inch, thus 2 inch. Unit.in(unit) is the same as method math.in(x, unit).
Implemented Unit.toNumber(unit), which returns the value of the unit when represented with given unit. For example math.unit('5.08 cm').toNumber('inch') returns the number 2, as the representation of the unit in inches has 2 as value.
Improved: method math.in(x, unit) now supports a string as second parameter, for example math.in(math.unit('5.08 cm'), 'inch').
Split the end user documentation of the parser functions from the source files.
Removed function help and the built-in documentation from the core library.
Fixed constant i being defined as -1i instead of 1i.
Minor bug fixes.

2013-04-06, version 0.5.0

Implemented data types Matrix and Range.
Implemented matrix methods clone, concat, det, diag, eye, inv, ones, size, squeeze, transpose, zeros.
Implemented range operator :, and transpose operator ' in parser.
Changed: created construction methods for easy object creation for all data types and for the parser. For example, a complex value is now created with math.complex(2, 3) instead of new math.Complex(2, 3), and a parser is now created with math.parser() instead of new math.parser.Parser().
Changed: moved all data types under the namespace math.type, and moved the Parser, Workspace, etc. under the namespace math.expr.
Changed: changed operator precedence of the power operator:
- it is now right associative instead of left associative like most scripting languages. So 2^3^4 is now calculated as 2^(3^4).
- it has now higher precedence than unary minus most languages, thus -3^2 is now calculated as -(3^2).
Changed: renamed the parsers method 'put' into 'set'.
Fixed: method 'in' did not check for units to have the same base.

2013-03-16, version 0.4.0

Implemented Array support for all methods.
Implemented Array support in the Parser.
Implemented method format.
Implemented parser for units, math.Unit.parse(str).
Improved parser for complex values math.Complex.parse(str);
Improved method help: it now evaluates the examples.
Fixed: a scoping issue with the Parser when defining functions.
Fixed: method 'typeof' was not working well with minified and mangled code.
Fixed: errors in determining the best prefix for a unit.

2013-03-09, version 0.3.0

Implemented Workspace
Implemented methods cot, csc, sec.
Implemented Array support for methods with one parameter.

2013-02-25, version 0.2.0

Parser, Scope, and expression tree with Nodes implemented.
Implemented method import which makes it easy to extend math.js.
Implemented methods arg, conj, cube, equal, factorial, im, largereq, log(x, base), log10, mod, re, sign, smallereq, square, unequal.

2013-02-18, version 0.1.0

Reached full compatibility with Javascripts built-in Math library.
More functions implemented.
Some bugfixes.

2013-02-16, version 0.0.2

All constants of Math implemented, plus the imaginary unit i.
Data types Complex and Unit implemented.
First set of functions implemented.

2013-02-15, version 0.0.1

First publish of the mathjs package. (package is still empty)

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