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cachematrix.R
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cachematrix.R
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#Below are two functions that are used to create a special object that stores a matrix and cache's its inverse.
#If you feed makeCacheMatrix a square matrix like the one commented out
#below it will create a special "Matrix" object which is really a list
#containing a function to:
#1. set the value of the matrix
#2. get the value of the matrix
#3. set the value of the inverse
#4. get the value of the inverse
#squareMatrix <- matrix(c(9, 13, 5, 2, 1, 11, 7, 6, 3, 7, 4, 1, 6, 0, 7, 10), nrow = 4, ncol = 4)
makeCacheMatrix <- function(x = matrix()) {
inverse <- NULL
set <- function(y) {
x <<- y
inverse <<- NULL
}
get <- function() x
setinverse <- function(inverse) inverse <<- inverse
getinverse <- function() inverse
x <<- list(set = set, get = get,
setinverse = setinverse,
getinverse = getinverse)
}
#The following function calculates the inverse of the special "matrix"
#created with the above function. However, it first checks to see if the
#inverse has already been calculated. If so, it gets the inverse from the
#cache and skips the computation. Otherwise, it calculates the inverse of
#the data and sets the value of the inverse in the cache via the setinverse
#function.
cacheSolve <- function(x, ...) {
inverse <- x$getinverse()
if(!is.null(inverse)) {
message("getting cached data")
return(inverse)
}
data <- x$get()
inverse <- solve(data, ...)
x$setinverse(inverse)
inverse
}