mirror of
https://github.com/josdejong/mathjs.git
synced 2025-12-08 19:46:04 +00:00
13a3d4c198
* setup linting with eslint-config-standard, prettier * [autofix] npm run lint -- --fix with new setup * [manual] fix types/ directory errors * [manual] fix linting errors in test/ directory * [manual] fix single linting error in src/ * revert ts-expect-error comment change * error on .only in mocha tests * fix test description typo * move some short objects to single line * add and gitignore eslintcache * individually suppress ts any * set --max-warnings to 0 * extract matrices to constants * update ts-expect-error comments
110 lines
4.4 KiB
JavaScript
110 lines
4.4 KiB
JavaScript
// test sign
|
|
import assert from 'assert'
|
|
|
|
import approx from '../../../../tools/approx.js'
|
|
import math from '../../../../src/defaultInstance.js'
|
|
const bignumber = math.bignumber
|
|
const fraction = math.fraction
|
|
const complex = math.complex
|
|
|
|
describe('sign', function () {
|
|
it('should calculate the sign of a boolean', function () {
|
|
assert.strictEqual(math.sign(true), 1)
|
|
assert.strictEqual(math.sign(false), 0)
|
|
})
|
|
|
|
it('should calculate the sign of a number', function () {
|
|
assert.strictEqual(math.sign(3), 1)
|
|
assert.strictEqual(math.sign(-3), -1)
|
|
assert.strictEqual(math.sign(0), 0)
|
|
})
|
|
|
|
it('should calculate the sign of a big number', function () {
|
|
assert.deepStrictEqual(math.sign(bignumber(3)), bignumber(1))
|
|
assert.deepStrictEqual(math.sign(bignumber(-3)), bignumber(-1))
|
|
assert.deepStrictEqual(math.sign(bignumber(0)), bignumber(0))
|
|
})
|
|
|
|
it('should calculate the sign of a fraction', function () {
|
|
const a = fraction(0.5)
|
|
assert(math.sign(a) instanceof math.Fraction)
|
|
assert.strictEqual(math.sign(a).toString(), '1')
|
|
assert.strictEqual(math.sign(fraction(-0.5)).toString(), '-1')
|
|
assert.strictEqual(a.toString(), '0.5')
|
|
})
|
|
|
|
it('should calculate the sign of a complex value', function () {
|
|
approx.deepEqual(math.sign(math.complex(2, -3)), math.complex(0.554700196225229, -0.832050294337844))
|
|
})
|
|
|
|
it('should calculate the sign of a unit', function () {
|
|
assert.strictEqual(math.sign(math.unit('5 cm')), 1)
|
|
assert.strictEqual(math.sign(math.unit('-5 kg')), -1)
|
|
assert.strictEqual(math.sign(math.unit('0 mol/s')), 0)
|
|
|
|
/* sign is ambiguous on units with offset, because you don't know if
|
|
* -3 degC is the difference between two temperatures, in which case
|
|
* it is definitely negative, or an actual temperature of something,
|
|
* in which case it is arguably positive. So actually mathjs should
|
|
* throw an error, which we will test below. Formerly:
|
|
assert.strictEqual(math.sign(math.unit('-283.15 degC')), -1)
|
|
assert.strictEqual(math.sign(math.unit('-273.15 degC')), 0)
|
|
assert.strictEqual(math.sign(math.unit('-263.15 degC')), 1)
|
|
*/
|
|
|
|
assert.deepStrictEqual(math.sign(math.unit(bignumber(5), 'cm')), bignumber(1))
|
|
assert.deepStrictEqual(math.sign(math.unit(bignumber(-5), 'cm')), bignumber(-1))
|
|
assert.deepStrictEqual(math.sign(math.unit(fraction(5), 'cm')), fraction(1))
|
|
assert.deepStrictEqual(math.sign(math.unit(fraction(-5), 'cm')), fraction(-1))
|
|
|
|
assert.deepStrictEqual(math.sign(math.unit(complex(3, 4), 'mi')), complex(0.6, 0.8))
|
|
})
|
|
|
|
it('should throw an error on a valueless unit or a unit with offset', function () {
|
|
assert.throws(() => math.sign(math.unit('ohm')), TypeError)
|
|
assert.throws(() => math.sign(math.unit('-3 degC')), /ambiguous/)
|
|
})
|
|
|
|
it('should throw an error when used with a string', function () {
|
|
assert.throws(function () { math.sign('hello world') })
|
|
})
|
|
|
|
it('should return a matrix of the signs of each elements in the given array', function () {
|
|
assert.deepStrictEqual(math.sign([-2, -1, 0, 1, 2]), [-1, -1, 0, 1, 1])
|
|
})
|
|
|
|
it('should return a matrix of the signs of each elements in the given matrix', function () {
|
|
assert.deepStrictEqual(math.sign(math.matrix([-2, -1, 0, 1, 2])), math.matrix([-1, -1, 0, 1, 1]))
|
|
})
|
|
|
|
it('should throw an error in case of invalid number of arguments', function () {
|
|
assert.throws(function () { math.sign() }, /TypeError: Too few arguments/)
|
|
assert.throws(function () { math.sign(1, 2) }, /TypeError: Too many arguments/)
|
|
})
|
|
|
|
it('should throw an in case of wrong type of arguments', function () {
|
|
assert.throws(function () { math.sign(null) }, /TypeError: Unexpected type of argument/)
|
|
})
|
|
|
|
describe('sign(0) should return 0', function () {
|
|
it('number', function () {
|
|
assert.strictEqual(math.sign(0), 0)
|
|
})
|
|
it('bignumber', function () {
|
|
assert.deepStrictEqual(math.sign(math.bignumber(0)), math.bignumber(0))
|
|
})
|
|
it('complex', function () {
|
|
assert.deepStrictEqual(math.sign(math.complex(0)), math.complex(0))
|
|
})
|
|
})
|
|
|
|
it('should throw an in case of wrong type of arguments', function () {
|
|
assert.throws(function () { math.sign(null) }, /TypeError: Unexpected type of argument/)
|
|
})
|
|
|
|
it('should LaTeX sign', function () {
|
|
const expression = math.parse('sign(-4)')
|
|
assert.strictEqual(expression.toTex(), '\\mathrm{sign}\\left(-4\\right)')
|
|
})
|
|
})
|