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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tanh = math.tanh,
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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 null', function () {
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approx.equal(tanh(null), 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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var tanhBig = bigmath.tanh;
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var Big = bigmath.bignumber;
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var arg1 = Big(-Infinity);
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var arg2 = Big(-3);
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var arg10 = Big(Infinity);
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assert.deepEqual(tanhBig(arg1), Big(-1));
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assert.deepEqual(tanhBig(arg2), Big('-0.99505475368673045133'));
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assert.deepEqual(tanhBig(Big(-2)), Big('-0.96402758007581688395'));
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assert.deepEqual(tanhBig(Big(-1)), Big('-0.76159415595576488812'));
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assert.deepEqual(tanhBig(Big(0)), Big(0));
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assert.deepEqual(tanhBig(Big(1)), Big('0.76159415595576488812'));
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assert.deepEqual(tanhBig(Big(2)), Big('0.96402758007581688395'));
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assert.deepEqual(tanhBig(Big(3)), Big('0.99505475368673045133'));
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assert.deepEqual(tanhBig(bigmath.pi).toString(), '0.99627207622074994426');
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assert.deepEqual(tanhBig(arg10), Big(1));
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// Make sure args were not changed
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assert.deepEqual(arg1.toString(), '-Infinity');
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assert.deepEqual(arg2, Big(-3));
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assert.deepEqual(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.type.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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var 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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var expression = math.parse('tanh(1)');
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assert.equal(expression.toTex(), '\\tanh\\left(1\\right)');
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});
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});
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