mirror of
https://github.com/josdejong/mathjs.git
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76 lines
3.2 KiB
JavaScript
76 lines
3.2 KiB
JavaScript
const assert = require('assert'), error = require('../../../src/error/index'), math = require('../../../src/main'), approx = require('../../../tools/approx'), pi = math.pi, complex = math.complex, matrix = math.matrix, unit = math.unit, csch = math.csch, bigmath = math.create({precision: 20}), biggermath = math.create({number: 'BigNumber', precision: 22})
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describe('csch', function () {
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it('should return the csch of a boolean', function () {
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approx.equal(csch(true), 0.85091812823932)
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approx.equal(csch(false), Number.POSITIVE_INFINITY)
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})
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it('should return the csch of a number', function () {
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approx.equal(csch(0), Number.POSITIVE_INFINITY)
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approx.equal(csch(pi), 0.086589537530047)
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approx.equal(csch(1), 0.85091812823932)
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approx.equal(csch(2), 0.27572056477178)
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approx.equal(csch(3), 0.099821569668823)
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approx.equal(csch(1e-22), Number.POSITIVE_INFINITY)
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approx.equal(csch(-1e-22), Number.NEGATIVE_INFINITY)
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})
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it('should return the csch of a bignumber', function () {
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const cschBig = bigmath.csch
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const Big = bigmath.bignumber
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assert.deepEqual(cschBig(Big(0)).toString(), 'Infinity')
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assert.deepEqual(cschBig(Big(1)), Big('0.85091812823932154512'))
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assert.deepEqual(cschBig(Big(2)), Big('0.27572056477178320776'))
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assert.deepEqual(cschBig(Big(3)), Big('0.099821569668822732851'))
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/* Pass in extra digits to pi. */
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assert.deepEqual(cschBig(biggermath.pi).toString(), '0.086589537530046941828')
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})
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it('should return the csch of a complex number', function () {
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approx.deepEqual(csch(complex('1')), complex(0.85091812823932, 0))
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approx.deepEqual(csch(complex('i')), complex(0, -1.1883951057781))
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approx.deepEqual(csch(complex('2 + i')), complex(0.14136302161241, -0.22837506559969))
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})
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it('should return the csch of an angle', function () {
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approx.equal(csch(unit('90deg')), 0.4345372080947)
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approx.equal(csch(unit('-45deg')), -1.1511838709208)
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assert(math.type.isBigNumber(csch(unit(math.bignumber(90), 'deg'))))
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approx.equal(csch(unit(math.bignumber(90), 'deg')).toNumber(), 0.4345372080947)
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approx.deepEqual(csch(unit(complex('2 + i'), 'rad')), complex(0.14136302161241, -0.22837506559969))
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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 () { csch(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 () { csch('string') })
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})
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const csch123 = [0.85091812823932, 0.27572056477178, 0.099821569668823]
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it('should return the csch of each element of an array', function () {
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approx.deepEqual(csch([1, 2, 3]), csch123)
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})
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it('should return the csch of each element of a matrix', function () {
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approx.deepEqual(csch(matrix([1, 2, 3])), matrix(csch123))
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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 () { csch() }, /TypeError: Too few arguments/)
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assert.throws(function () { csch(1, 2) }, /TypeError: Too many arguments/)
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})
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it('should LaTeX csch', function () {
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const expression = math.parse('csch(1)')
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assert.equal(expression.toTex(), '\\mathrm{csch}\\left(1\\right)')
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})
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})
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