mirror of
https://github.com/josdejong/mathjs.git
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aedbee550d
* sign of zero fraction should return 0/1 instead of 1/1 * moved fraction zero test into correct fraction block * moved fraction zero test into correct fraction block
119 lines
4.6 KiB
JavaScript
119 lines
4.6 KiB
JavaScript
// test sign
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import assert from 'assert'
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import { approxDeepEqual } from '../../../../tools/approx.js'
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import math from '../../../../src/defaultInstance.js'
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const bignumber = math.bignumber
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const fraction = math.fraction
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const complex = math.complex
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describe('sign', function () {
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it('should calculate the sign of a boolean', function () {
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assert.strictEqual(math.sign(true), 1)
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assert.strictEqual(math.sign(false), 0)
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})
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it('should calculate the sign of a number', function () {
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assert.strictEqual(math.sign(3), 1)
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assert.strictEqual(math.sign(-3), -1)
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assert.strictEqual(math.sign(0), 0)
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})
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it('should calculate the sign of a bigint', function () {
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assert.strictEqual(math.sign(3n), 1n)
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assert.strictEqual(math.sign(-3n), -1n)
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assert.strictEqual(math.sign(0n), 0n)
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})
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it('should calculate the sign of a big number', function () {
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assert.deepStrictEqual(math.sign(bignumber(3)), bignumber(1))
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assert.deepStrictEqual(math.sign(bignumber(-3)), bignumber(-1))
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assert.deepStrictEqual(math.sign(bignumber(0)), bignumber(0))
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})
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it('should calculate the sign of a fraction', function () {
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const a = fraction(0.5)
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assert(math.sign(a) instanceof math.Fraction)
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assert.strictEqual(math.sign(a).toString(), '1')
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assert.strictEqual(math.sign(fraction(-0.5)).toString(), '-1')
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assert.strictEqual(a.toString(), '0.5')
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assert.deepStrictEqual(math.sign(math.fraction(0)), math.fraction(0))
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})
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it('should calculate the sign of a complex value', function () {
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approxDeepEqual(math.sign(math.complex(2, -3)), math.complex(0.554700196225229, -0.832050294337844))
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})
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it('should calculate the sign of a unit', function () {
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assert.strictEqual(math.sign(math.unit('5 cm')), 1)
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assert.strictEqual(math.sign(math.unit('-5 kg')), -1)
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assert.strictEqual(math.sign(math.unit('0 mol/s')), 0)
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/* sign is ambiguous on units with offset, because you don't know if
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* -3 degC is the difference between two temperatures, in which case
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* it is definitely negative, or an actual temperature of something,
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* in which case it is arguably positive. So actually mathjs should
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* throw an error, which we will test below. Formerly:
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assert.strictEqual(math.sign(math.unit('-283.15 degC')), -1)
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assert.strictEqual(math.sign(math.unit('-273.15 degC')), 0)
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assert.strictEqual(math.sign(math.unit('-263.15 degC')), 1)
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*/
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assert.deepStrictEqual(math.sign(math.unit(bignumber(5), 'cm')), bignumber(1))
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assert.deepStrictEqual(math.sign(math.unit(bignumber(-5), 'cm')), bignumber(-1))
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assert.deepStrictEqual(math.sign(math.unit(fraction(5), 'cm')), fraction(1))
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assert.deepStrictEqual(math.sign(math.unit(fraction(-5), 'cm')), fraction(-1))
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assert.deepStrictEqual(math.sign(math.unit(complex(3, 4), 'mi')), complex(0.6, 0.8))
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})
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it('should throw an error on a valueless unit or a unit with offset', function () {
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assert.throws(() => math.sign(math.unit('ohm')), TypeError)
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assert.throws(() => math.sign(math.unit('-3 degC')), /ambiguous/)
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})
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it('should throw an error when used with a string', function () {
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assert.throws(function () { math.sign('hello world') })
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})
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it('should return a matrix of the signs of each elements in the given array', function () {
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assert.deepStrictEqual(math.sign([-2, -1, 0, 1, 2]), [-1, -1, 0, 1, 1])
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})
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it('should return a matrix of the signs of each elements in the given matrix', function () {
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assert.deepStrictEqual(math.sign(math.matrix([-2, -1, 0, 1, 2])), math.matrix([-1, -1, 0, 1, 1]))
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})
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it('should throw an error in case of invalid number of arguments', function () {
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assert.throws(function () { math.sign() }, /TypeError: Too few arguments/)
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assert.throws(function () { math.sign(1, 2) }, /TypeError: Too many arguments/)
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})
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it('should throw an in case of wrong type of arguments', function () {
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assert.throws(function () { math.sign(null) }, /TypeError: Unexpected type of argument/)
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})
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describe('sign(0) should return 0', function () {
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it('number', function () {
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assert.strictEqual(math.sign(0), 0)
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})
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it('bignumber', function () {
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assert.deepStrictEqual(math.sign(math.bignumber(0)), math.bignumber(0))
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})
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it('complex', function () {
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assert.deepStrictEqual(math.sign(math.complex(0)), math.complex(0))
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})
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})
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it('should throw an in case of wrong type of arguments', function () {
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assert.throws(function () { math.sign(null) }, /TypeError: Unexpected type of argument/)
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})
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it('should LaTeX sign', function () {
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const expression = math.parse('sign(-4)')
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assert.strictEqual(expression.toTex(), '\\mathrm{sign}\\left(-4\\right)')
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})
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})
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