mirror of
https://github.com/josdejong/mathjs.git
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76 lines
2.6 KiB
JavaScript
76 lines
2.6 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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sin = math.sin,
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cos = math.cos,
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tan = math.tan;
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describe('tan', function() {
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it('should return the tangent of a boolean', function () {
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approx.equal(tan(true), 1.55740772465490);
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approx.equal(tan(false), 0);
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});
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it('should return the tangent of a number', function() {
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approx.equal(tan(0), 0);
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approx.equal(tan(pi*1/4), 1);
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approx.equal(tan(pi*1/8), 0.414213562373095);
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assert.ok(tan(pi*2/4) > 1e10);
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approx.equal(tan(pi*3/4), -1);
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approx.equal(tan(pi*4/4), 0);
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approx.equal(tan(pi*5/4), 1);
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assert.ok(tan(pi*6/4) > 1e10);
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approx.equal(tan(pi*7/4), -1);
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approx.equal(tan(pi*8/4), 0);
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});
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it('should return the tangent of a bignumber (downgrades to number)', function() {
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approx.equal(tan(math.bignumber(1)), 1.55740772465490);
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});
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it('should return the tangent of a complex number', function() {
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var re = 0.00376402564150425,
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im = 1.00323862735360980;
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approx.deepEqual(tan(complex('2+3i')), complex(-re, im));
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approx.deepEqual(tan(complex('2-3i')), complex(-re, -im));
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approx.deepEqual(tan(complex('-2+3i')), complex(re, im));
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approx.deepEqual(tan(complex('-2-3i')), complex(re, -im));
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approx.deepEqual(tan(complex('i')), complex(0, 0.761594155955765));
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approx.deepEqual(tan(complex('1')), complex(1.55740772465490, 0));
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approx.deepEqual(tan(complex('1+i')), complex(0.271752585319512, 1.083923327338695));
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});
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it('should return the tangent of an angle', function() {
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approx.equal(tan(unit(' 60deg')), math.sqrt(3));
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approx.equal(tan(unit('-135deg')), 1);
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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 () {tan(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 () {tan('string')});
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});
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var tan123 = [1.557407724654902, -2.185039863261519, -0.142546543074278];
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it('should return the tan of each element of an array', function() {
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approx.deepEqual(tan([1,2,3]), tan123);
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});
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it('should return the tan of each element of a matrix', function() {
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approx.deepEqual(tan(matrix([1,2,3])), matrix(tan123));
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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 () {tan()}, error.ArgumentsError);
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assert.throws(function () {tan(1, 2)}, error.ArgumentsError);
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});
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}); |