mirror of https://github.com/gchq/CyberChef.git
140 lines
2.9 KiB
JavaScript
140 lines
2.9 KiB
JavaScript
/**
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* @author bwhitn [brian.m.whitney@outlook.com]
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* @author d98762625 [d98762625@gmailcom]
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* @copyright Crown Copyright 2018
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* @license Apache-2.0
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*/
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import Utils from "../Utils.mjs";
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import BigNumber from "bignumber.js";
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/**
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* Converts a string array to a number array.
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*
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* @param {string[]} input
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* @param {string} delim
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* @returns {BigNumber[]}
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*/
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export function createNumArray(input, delim) {
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delim = Utils.charRep(delim || "Space");
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const splitNumbers = input.split(delim);
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const numbers = [];
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let num;
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splitNumbers.map((number) => {
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try {
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num = BigNumber(number.trim());
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if (!num.isNaN()) {
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numbers.push(num);
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}
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} catch (err) {
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// This line is not a valid number
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}
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});
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return numbers;
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}
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/**
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* Adds an array of numbers and returns the value.
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*
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* @param {BigNumber[]} data
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* @returns {BigNumber}
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*/
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export function sum(data) {
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if (data.length > 0) {
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return data.reduce((acc, curr) => acc.plus(curr));
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}
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}
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/**
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* Subtracts an array of numbers and returns the value.
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*
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* @param {BigNumber[]} data
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* @returns {BigNumber}
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*/
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export function sub(data) {
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if (data.length > 0) {
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return data.reduce((acc, curr) => acc.minus(curr));
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}
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}
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/**
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* Multiplies an array of numbers and returns the value.
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*
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* @param {BigNumber[]} data
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* @returns {BigNumber}
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*/
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export function multi(data) {
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if (data.length > 0) {
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return data.reduce((acc, curr) => acc.times(curr));
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}
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}
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/**
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* Divides an array of numbers and returns the value.
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*
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* @param {BigNumber[]} data
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* @returns {BigNumber}
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*/
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export function div(data) {
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if (data.length > 0) {
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return data.reduce((acc, curr) => acc.div(curr));
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}
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}
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/**
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* Computes mean of a number array and returns the value.
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*
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* @param {BigNumber[]} data
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* @returns {BigNumber}
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*/
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export function mean(data) {
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if (data.length > 0) {
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return sum(data).div(data.length);
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}
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}
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/**
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* Computes median of a number array and returns the value.
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*
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* @param {BigNumber[]} data
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* @returns {BigNumber}
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*/
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export function median(data) {
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if ((data.length % 2) === 0 && data.length > 0) {
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data.sort(function(a, b) {
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return a.minus(b);
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});
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const first = data[Math.floor(data.length / 2)];
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const second = data[Math.floor(data.length / 2) - 1];
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return mean([first, second]);
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} else {
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return data[Math.floor(data.length / 2)];
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}
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}
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/**
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* Computes standard deviation of a number array and returns the value.
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*
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* @param {BigNumber[]} data
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* @returns {BigNumber}
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*/
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export function stdDev(data) {
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if (data.length > 0) {
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const avg = mean(data);
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let devSum = new BigNumber(0);
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data.map((datum) => {
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devSum = devSum.plus(datum.minus(avg).pow(2));
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});
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return devSum.div(data.length).sqrt();
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}
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}
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