mirror of
https://github.com/josdejong/mathjs.git
synced 2025-12-08 19:46:04 +00:00
75 lines
2.7 KiB
JavaScript
75 lines
2.7 KiB
JavaScript
var assert = require('assert'),
|
|
error = require('../../../lib/error/index'),
|
|
math = require('../../../index'),
|
|
approx = require('../../../tools/approx'),
|
|
pi = math.pi,
|
|
complex = math.complex,
|
|
matrix = math.matrix,
|
|
unit = math.unit,
|
|
cos = math.cos;
|
|
|
|
describe('cos', function() {
|
|
it('should return the cosine of a boolean', function () {
|
|
approx.equal(cos(true), 0.54030230586814);
|
|
approx.equal(cos(false), 1);
|
|
});
|
|
|
|
it('should return the cosine of a number', function() {
|
|
approx.equal(cos(0), 1);
|
|
approx.equal(cos(pi*1/4), 0.707106781186548);
|
|
approx.equal(cos(pi*1/8), 0.923879532511287);
|
|
approx.equal(cos(pi*2/4), 0);
|
|
approx.equal(cos(pi*3/4), -0.707106781186548);
|
|
approx.equal(cos(pi*4/4), -1);
|
|
approx.equal(cos(pi*5/4), -0.707106781186548);
|
|
approx.equal(cos(pi*6/4), 0);
|
|
approx.equal(cos(pi*7/4), 0.707106781186548);
|
|
approx.equal(cos(pi*8/4), 1);
|
|
approx.equal(cos(pi/4), math.sqrt(2)/2);
|
|
});
|
|
|
|
it('should return the cosine of a bignumber (downgrades to number)', function() {
|
|
approx.equal(cos(math.bignumber(1)), 0.54030230586814);
|
|
});
|
|
|
|
it('should return the cosine of a complex number', function() {
|
|
var re = 4.18962569096881,
|
|
im = 9.10922789375534;
|
|
approx.deepEqual(cos(complex('2+3i')), complex(-re, -im));
|
|
approx.deepEqual(cos(complex('2-3i')), complex(-re, im));
|
|
approx.deepEqual(cos(complex('-2+3i')), complex(-re, im));
|
|
approx.deepEqual(cos(complex('-2-3i')), complex(-re, -im));
|
|
approx.deepEqual(cos(complex('i')), complex(1.54308063481524, 0));
|
|
approx.deepEqual(cos(complex('1')), complex(0.540302305868140, 0));
|
|
approx.deepEqual(cos(complex('1+i')), complex(0.833730025131149, -0.988897705762865));
|
|
});
|
|
|
|
it('should return the cosine of an angle', function() {
|
|
approx.equal(cos(unit('45deg')), 0.707106781186548);
|
|
approx.equal(cos(unit('-135deg')), -0.707106781186548);
|
|
});
|
|
|
|
it('should throw an error if called with an invalid unit', function() {
|
|
assert.throws(function () {cos(unit('5 celsius'))});
|
|
});
|
|
|
|
it('should throw an error if called with a string', function() {
|
|
assert.throws(function () {cos('string')});
|
|
});
|
|
|
|
var cos123 = [0.540302305868140, -0.41614683654714, -0.989992496600445];
|
|
|
|
it('should return the cos of each element of a matrix', function() {
|
|
approx.deepEqual(cos(matrix([1,2,3])), matrix(cos123));
|
|
});
|
|
|
|
it('should return the cos of each element of an array', function() {
|
|
approx.deepEqual(cos([1,2,3]), cos123);
|
|
});
|
|
|
|
it('should throw an error in case of invalid number of arguments', function() {
|
|
assert.throws(function () {cos()}, error.ArgumentsError);
|
|
assert.throws(function () {cos(1, 2)}, error.ArgumentsError);
|
|
});
|
|
|
|
}); |