mirror of
https://github.com/josdejong/mathjs.git
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93 lines
3.5 KiB
JavaScript
93 lines
3.5 KiB
JavaScript
import assert from 'assert'
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import math from '../../../../src/bundleAny'
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import approx from '../../../../tools/approx'
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const pi = math.pi
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const complex = math.complex
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const matrix = math.matrix
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const unit = math.unit
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const tanh = math.tanh
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const bigmath = math.create({ number: 'BigNumber', precision: 20 })
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describe('tanh', function () {
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it('should return the tanh of a boolean', function () {
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approx.equal(tanh(true), 0.76159415595576)
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approx.equal(tanh(false), 0)
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})
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it('should return the tanh of a number', function () {
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approx.equal(tanh(0), 0)
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approx.equal(tanh(pi), 0.99627207622075)
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approx.equal(tanh(1), 0.76159415595576)
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approx.equal(tanh(2), 0.96402758007582)
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approx.equal(tanh(3), 0.99505475368673)
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})
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it('should return the tanh of a bignumber', function () {
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const tanhBig = bigmath.tanh
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const Big = bigmath.bignumber
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const arg1 = Big(-Infinity)
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const arg2 = Big(-3)
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const arg10 = Big(Infinity)
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assert.deepStrictEqual(tanhBig(arg1), Big(-1))
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assert.deepStrictEqual(tanhBig(arg2), Big('-0.99505475368673045133'))
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assert.deepStrictEqual(tanhBig(Big(-2)), Big('-0.96402758007581688395'))
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assert.deepStrictEqual(tanhBig(Big(-1)), Big('-0.76159415595576488812'))
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assert.deepStrictEqual(tanhBig(Big(0)), Big(0))
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assert.deepStrictEqual(tanhBig(Big(1)), Big('0.76159415595576488812'))
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assert.deepStrictEqual(tanhBig(Big(2)), Big('0.96402758007581688395'))
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assert.deepStrictEqual(tanhBig(Big(3)), Big('0.99505475368673045133'))
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assert.deepStrictEqual(tanhBig(bigmath.pi).toString(), '0.99627207622074994426')
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assert.deepStrictEqual(tanhBig(arg10), Big(1))
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// Make sure args were not changed
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assert.deepStrictEqual(arg1.toString(), '-Infinity')
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assert.deepStrictEqual(arg2, Big(-3))
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assert.deepStrictEqual(arg10.toString(), 'Infinity')
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})
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it('should return the tanh of a complex number', function () {
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approx.deepEqual(tanh(complex('1')), complex(0.76159415595576, 0))
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approx.deepEqual(tanh(complex('i')), complex(0, 1.5574077246549))
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approx.deepEqual(tanh(complex('2 + i')), complex(1.0147936161466, 0.033812826079897))
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})
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it('should return the tanh of an angle', function () {
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approx.equal(tanh(unit('90deg')), 0.91715233566727)
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approx.equal(tanh(unit('-45deg')), -0.65579420263267)
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assert(math.isBigNumber(tanh(unit(math.bignumber(90), 'deg'))))
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approx.equal(tanh(unit(math.bignumber(90), 'deg')).toNumber(), 0.91715233566727)
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approx.deepEqual(tanh(unit(complex('2 + i'), 'rad')), complex(1.0147936161466, 0.033812826079897))
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})
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it('should throw an error if called with an invalid unit', function () {
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assert.throws(function () { tanh(unit('5 celsius')) })
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})
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it('should throw an error if called with a string', function () {
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assert.throws(function () { tanh('string') })
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})
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const tanh123 = [0.76159415595576, 0.96402758007582, 0.99505475368673]
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it('should return the tanh of each element of an array', function () {
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approx.deepEqual(tanh([1, 2, 3]), tanh123)
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})
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it('should return the tanh of each element of a matrix', function () {
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approx.deepEqual(tanh(matrix([1, 2, 3])), matrix(tanh123))
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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 () { tanh() }, /TypeError: Too few arguments/)
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assert.throws(function () { tanh(1, 2) }, /TypeError: Too many arguments/)
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})
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it('should LaTeX tanh', function () {
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const expression = math.parse('tanh(1)')
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assert.strictEqual(expression.toTex(), '\\tanh\\left(1\\right)')
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})
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})
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