mirror of
https://github.com/josdejong/mathjs.git
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98 lines
3.7 KiB
JavaScript
98 lines
3.7 KiB
JavaScript
var assert = require('assert'),
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error = require('../../../lib/error/index'),
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math = require('../../../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 null', function () {
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approx.equal(cosh(null), 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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