mirror of
https://github.com/josdejong/mathjs.git
synced 2026-01-25 15:07:57 +00:00
94 lines
3.6 KiB
JavaScript
94 lines
3.6 KiB
JavaScript
var assert = require('assert'),
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error = require('../../../src/error/index'),
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math = require('../../../src/index'),
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approx = require('../../../tools/approx'),
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pi = math.pi,
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complex = math.complex,
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matrix = math.matrix,
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unit = math.unit,
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cosh = math.cosh,
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bigmath = math.create({number: 'BigNumber', precision: 20})
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describe('cosh', function () {
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it('should return the cosh of a boolean', function () {
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approx.equal(cosh(true), 1.5430806348152)
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approx.equal(cosh(false), 1)
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})
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it('should return the cosh of a number', function () {
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approx.equal(cosh(0), 1)
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approx.equal(cosh(pi), 11.591953275522)
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approx.equal(cosh(1), 1.5430806348152)
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approx.equal(cosh(2), 3.7621956910836)
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approx.equal(cosh(3), 10.067661995778)
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})
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it('should return the cosh of a bignumber', function () {
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var coshBig = bigmath.cosh
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var Big = bigmath.bignumber
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var arg1 = Big(-3)
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var arg9 = Big(Infinity)
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var arg10 = Big(-Infinity)
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assert.deepEqual(coshBig(arg1), Big('10.067661995777765842'))
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assert.deepEqual(coshBig(Big(-2)), Big('3.7621956910836314596'))
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assert.deepEqual(coshBig(Big(-1)), Big('1.5430806348152437785'))
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assert.deepEqual(coshBig(Big(0)), Big(1))
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assert.deepEqual(coshBig(Big(1)), Big('1.5430806348152437785'))
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assert.deepEqual(coshBig(Big(2)), Big('3.7621956910836314596'))
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assert.deepEqual(coshBig(Big(3)), Big('10.067661995777765842'))
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assert.deepEqual(coshBig(bigmath.pi).toString(), '11.591953275521520628')
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assert.deepEqual(coshBig(arg9).toString(), 'Infinity')
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assert.deepEqual(coshBig(arg10).toString(), 'Infinity')
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// Ensure args were not changed
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assert.deepEqual(arg1, Big(-3))
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assert.deepEqual(arg9.toString(), 'Infinity')
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assert.deepEqual(arg10.toString(), '-Infinity')
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})
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it('should return the cosh of a complex number', function () {
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approx.deepEqual(cosh(complex('1')), complex(1.5430806348152, 0))
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approx.deepEqual(cosh(complex('i')), complex(0.54030230586814, 0))
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approx.deepEqual(cosh(complex('2 + i')), complex(2.0327230070197, 3.0518977991518))
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})
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it('should return the cosh of an angle', function () {
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approx.equal(cosh(unit('90deg')), 2.5091784786581)
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approx.equal(cosh(unit('-45deg')), 1.324609089252)
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assert(math.type.isBigNumber(cosh(unit(math.bignumber(90), 'deg'))))
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approx.equal(cosh(unit(math.bignumber(90), 'deg')).toNumber(), 2.5091784786581)
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approx.deepEqual(cosh(math.unit(complex('2 + i'), 'rad')), complex(2.0327230070197, 3.0518977991518))
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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 () { cosh(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 () { cosh('string') })
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})
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var cosh123 = [1.5430806348152, 3.7621956910836, 10.067661995778]
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it('should return the cosh of each element of an array', function () {
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approx.deepEqual(cosh([1, 2, 3]), cosh123)
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})
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it('should return the cosh of each element of a matrix', function () {
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approx.deepEqual(cosh(matrix([1, 2, 3])), matrix(cosh123))
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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 () { cosh() }, /TypeError: Too few arguments/)
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assert.throws(function () { cosh(1, 2) }, /TypeError: Too many arguments/)
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})
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it('should LaTeX cosh', function () {
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var expression = math.parse('cosh(1)')
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assert.equal(expression.toTex(), '\\cosh\\left(1\\right)')
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})
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})
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