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...ugin-plugins-expressions-public.expressionfunctiondefinitions.moving_average.md
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| <!-- Do not edit this file. It is automatically generated by API Documenter. --> | ||
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| [Home](./index.md) > [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) > [ExpressionFunctionDefinitions](./kibana-plugin-plugins-expressions-public.expressionfunctiondefinitions.md) > [moving\_average](./kibana-plugin-plugins-expressions-public.expressionfunctiondefinitions.moving_average.md) | ||
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| ## ExpressionFunctionDefinitions.moving\_average property | ||
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| <b>Signature:</b> | ||
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| ```typescript | ||
| moving_average: ExpressionFunctionMovingAverage; | ||
| ``` |
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...ugin-plugins-expressions-server.expressionfunctiondefinitions.moving_average.md
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| <!-- Do not edit this file. It is automatically generated by API Documenter. --> | ||
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| [Home](./index.md) > [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) > [ExpressionFunctionDefinitions](./kibana-plugin-plugins-expressions-server.expressionfunctiondefinitions.md) > [moving\_average](./kibana-plugin-plugins-expressions-server.expressionfunctiondefinitions.moving_average.md) | ||
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| ## ExpressionFunctionDefinitions.moving\_average property | ||
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| <b>Signature:</b> | ||
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| ```typescript | ||
| moving_average: ExpressionFunctionMovingAverage; | ||
| ``` |
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src/plugins/expressions/common/expression_functions/specs/moving_average.ts
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| /* | ||
| * Licensed to Elasticsearch B.V. under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch B.V. licenses this file to you under | ||
| * the Apache License, Version 2.0 (the "License"); you may | ||
| * not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
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| import { i18n } from '@kbn/i18n'; | ||
| import { ExpressionFunctionDefinition } from '../types'; | ||
| import { Datatable } from '../../expression_types'; | ||
| import { buildResultColumns, getBucketIdentifier } from './series_calculation_helpers'; | ||
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| export interface MovingAverageArgs { | ||
| by?: string[]; | ||
| inputColumnId: string; | ||
| outputColumnId: string; | ||
| outputColumnName?: string; | ||
| window: number; | ||
| } | ||
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| export type ExpressionFunctionMovingAverage = ExpressionFunctionDefinition< | ||
| 'moving_average', | ||
| Datatable, | ||
| MovingAverageArgs, | ||
| Datatable | ||
| >; | ||
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| /** | ||
| * Calculates the moving average of a specified column in the data table. | ||
| * | ||
| * Also supports multiple series in a single data table - use the `by` argument | ||
| * to specify the columns to split the calculation by. | ||
| * For each unique combination of all `by` columns a separate moving average will be calculated. | ||
| * The order of rows won't be changed - this function is not modifying any existing columns, it's only | ||
| * adding the specified `outputColumnId` column to every row of the table without adding or removing rows. | ||
| * | ||
| * Behavior: | ||
| * * Will write the moving average of `inputColumnId` into `outputColumnId` | ||
| * * If provided will use `outputColumnName` as name for the newly created column. Otherwise falls back to `outputColumnId` | ||
| * * Moving average always starts with an undefined value for the first row of a series. Each next cell will contain sum of the last | ||
| * * [window] of values divided by [window] excluding the current bucket. | ||
| * If either of window edges moves outside the borders of data series, the window shrinks to include available values only. | ||
| * | ||
| * Edge cases: | ||
| * * Will return the input table if `inputColumnId` does not exist | ||
| * * Will throw an error if `outputColumnId` exists already in provided data table | ||
| * * If null or undefined value is encountered, skip the current row and do not change the window | ||
| * * For all values besides `null` and `undefined`, the value will be cast to a number before it's used in the | ||
| * calculation of the current series even if this results in `NaN` (like in case of objects). | ||
| * * To determine separate series defined by the `by` columns, the values of these columns will be cast to strings | ||
| * before comparison. If the values are objects, the return value of their `toString` method will be used for comparison. | ||
| */ | ||
| export const movingAverage: ExpressionFunctionMovingAverage = { | ||
| name: 'moving_average', | ||
| type: 'datatable', | ||
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| inputTypes: ['datatable'], | ||
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| help: i18n.translate('expressions.functions.movingAverage.help', { | ||
| defaultMessage: 'Calculates the moving average of a column in a data table', | ||
| }), | ||
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| args: { | ||
| by: { | ||
| help: i18n.translate('expressions.functions.movingAverage.args.byHelpText', { | ||
| defaultMessage: 'Column to split the moving average calculation by', | ||
| }), | ||
| multi: true, | ||
| types: ['string'], | ||
| required: false, | ||
| }, | ||
| inputColumnId: { | ||
| help: i18n.translate('expressions.functions.movingAverage.args.inputColumnIdHelpText', { | ||
| defaultMessage: 'Column to calculate the moving average of', | ||
| }), | ||
| types: ['string'], | ||
| required: true, | ||
| }, | ||
| outputColumnId: { | ||
| help: i18n.translate('expressions.functions.movingAverage.args.outputColumnIdHelpText', { | ||
| defaultMessage: 'Column to store the resulting moving average in', | ||
| }), | ||
| types: ['string'], | ||
| required: true, | ||
| }, | ||
| outputColumnName: { | ||
| help: i18n.translate('expressions.functions.movingAverage.args.outputColumnNameHelpText', { | ||
| defaultMessage: 'Name of the column to store the resulting moving average in', | ||
| }), | ||
| types: ['string'], | ||
| required: false, | ||
| }, | ||
| window: { | ||
| help: i18n.translate('expressions.functions.movingAverage.args.windowHelpText', { | ||
| defaultMessage: 'The size of window to "slide" across the histogram.', | ||
| }), | ||
| types: ['number'], | ||
| default: 5, | ||
| }, | ||
| }, | ||
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| fn(input, { by, inputColumnId, outputColumnId, outputColumnName, window }) { | ||
| const resultColumns = buildResultColumns( | ||
| input, | ||
| outputColumnId, | ||
| inputColumnId, | ||
| outputColumnName | ||
| ); | ||
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| if (!resultColumns) { | ||
| return input; | ||
| } | ||
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| const lastNValuesByBucket: Partial<Record<string, number[]>> = {}; | ||
| return { | ||
| ...input, | ||
| columns: resultColumns, | ||
| rows: input.rows.map((row) => { | ||
| const newRow = { ...row }; | ||
| const bucketIdentifier = getBucketIdentifier(row, by); | ||
| const lastNValues = lastNValuesByBucket[bucketIdentifier]; | ||
| const currentValue = newRow[inputColumnId]; | ||
| if (lastNValues != null && currentValue != null) { | ||
| const sum = lastNValues.reduce((acc, current) => acc + current, 0); | ||
| newRow[outputColumnId] = sum / lastNValues.length; | ||
| } else { | ||
| newRow[outputColumnId] = undefined; | ||
| } | ||
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| if (currentValue != null) { | ||
| lastNValuesByBucket[bucketIdentifier] = [ | ||
| ...(lastNValues || []), | ||
| Number(currentValue), | ||
| ].slice(-window); | ||
| } | ||
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| return newRow; | ||
| }), | ||
| }; | ||
| }, | ||
| }; |
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