mirror of
https://github.com/josdejong/mathjs.git
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c5971b371a
* chore(package): update standard to version 12.0.0
* update to new lint version with --fix
I believe this mainly adds whitespace to `{}`'s.
* Replace assert.equal with assert.strictEqual
This breaks a lot of tests which I will endevour to fix in the next
commits.
* Fix most errors due to assert.strictEquals
Some instances of `strictEquals` are replaced by `deepEquals`.
`toString` has been used to make some string comparisions explicit.
Tests will still fail untill #1236 and #1237 are fixed.
* Fix assertion erros due to -0
With node 10, assert.strictEqual no longer considers `0 === -0`.
I missed these first time round as I was using node 8.
* Put toString correct side of bracket
I was converting the constructor to a string rather
than the result of the computation. Oops.
* Fixed #1236: quantileSeq has inconsistant return
* Update package-lock
* Fixed #1237: norm sometimes returning a complex number instead of number
* Fix cli tests
* More changes for standardjs, and fixes in unit tests
81 lines
1.9 KiB
JavaScript
81 lines
1.9 KiB
JavaScript
'use strict'
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const deepMap = require('../../utils/collection/deepMap')
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function factory (type, config, load, typed) {
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/**
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* Calculate the square root of a value.
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*
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* For matrices, the function is evaluated element wise.
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*
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* Syntax:
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*
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* math.sqrt(x)
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*
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* Examples:
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*
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* math.sqrt(25) // returns 5
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* math.square(5) // returns 25
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* math.sqrt(-4) // returns Complex 2i
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*
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* See also:
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*
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* square, multiply, cube, cbrt, sqrtm
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*
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* @param {number | BigNumber | Complex | Array | Matrix | Unit} x
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* Value for which to calculate the square root.
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* @return {number | BigNumber | Complex | Array | Matrix | Unit}
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* Returns the square root of `x`
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*/
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const sqrt = typed('sqrt', {
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'number': _sqrtNumber,
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'Complex': function (x) {
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return x.sqrt()
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},
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'BigNumber': function (x) {
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if (!x.isNegative() || config.predictable) {
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return x.sqrt()
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} else {
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// negative value -> downgrade to number to do complex value computation
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return _sqrtNumber(x.toNumber())
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}
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},
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'Array | Matrix': function (x) {
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// deep map collection, skip zeros since sqrt(0) = 0
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return deepMap(x, sqrt, true)
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},
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'Unit': function (x) {
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// Someday will work for complex units when they are implemented
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return x.pow(0.5)
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}
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})
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/**
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* Calculate sqrt for a number
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* @param {number} x
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* @returns {number | Complex} Returns the square root of x
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* @private
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*/
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function _sqrtNumber (x) {
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if (isNaN(x)) {
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return NaN
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} else if (x >= 0 || config.predictable) {
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return Math.sqrt(x)
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} else {
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return new type.Complex(x, 0).sqrt()
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}
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}
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sqrt.toTex = { 1: `\\sqrt{\${args[0]}}` }
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return sqrt
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}
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exports.name = 'sqrt'
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exports.factory = factory
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