mirror of
https://github.com/josdejong/mathjs.git
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93 lines
3.0 KiB
JavaScript
93 lines
3.0 KiB
JavaScript
// test atan2
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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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acos = math.acos,
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atan = math.atan,
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asin = math.asin,
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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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divide = math.divide,
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round = math.round,
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sec = math.sec,
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csc = math.csc,
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cot = math.cot,
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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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atan2 = math.atan2;
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describe('atan2', function() {
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it('should calculate atan2 correctly', function() {
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approx.equal(atan2(0, 0) / pi, 0);
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approx.equal(atan2(0, 1) / pi, 0);
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approx.equal(atan2(1, 1) / pi, 0.25);
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approx.equal(atan2(1, 0) / pi, 0.5);
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approx.equal(atan2(1, -1) / pi, 0.75);
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approx.equal(atan2(0, -1) / pi, 1);
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approx.equal(atan2(-1, -1) / pi, -0.75);
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approx.equal(atan2(-1, 0) / pi, -0.5);
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approx.equal(atan2(-1, 1) / pi, -0.25);
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});
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it('should calculate atan2 for booleans', function() {
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assert.equal(atan2(true, true), 0.25 * pi);
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assert.equal(atan2(true, false), 0.5 * pi);
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assert.equal(atan2(false, true), 0);
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assert.equal(atan2(false, false), 0);
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});
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it('should calculate atan2 with mixed numbers and booleans', function() {
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assert.equal(atan2(1, true), 0.25 * pi);
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assert.equal(atan2(1, false), 0.5 * pi);
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assert.equal(atan2(true, 1), 0.25 * pi);
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assert.equal(atan2(false, 1), 0);
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});
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it('should calculate atan2 with mixed numbers and null', function() {
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assert.equal(atan2(1, null), 0.5 * pi);
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assert.equal(atan2(null, 1), 0);
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});
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it('should return the arctan of for bignumbers (downgrades to number)', function() {
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approx.equal(atan2(math.bignumber(1), math.bignumber(1)), pi / 4);
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});
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it('should return the arctan of for mixed numbers and bignumbers (downgrades to number)', function() {
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approx.equal(atan2(1, math.bignumber(1)), pi / 4);
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approx.equal(atan2(math.bignumber(1), 1), pi / 4);
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});
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it('should throw an error if called with a complex', function() {
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assert.throws(function () {atan2(complex('2+3i'), complex('1-2i')); });
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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 () {atan2('string', 1)});
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});
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it('should throw an error if called with a unit', function() {
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assert.throws(function () {atan2(unit('5cm'), 1)});
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});
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it('should calculate the atan2 element-wise for arrays and matrices', function() {
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// array, matrix, range
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approx.deepEqual(divide(atan2([1,0,-1], [1,0,-1]), pi), [0.25, 0, -0.75]);
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approx.deepEqual(divide(atan2(
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matrix([1,0,-1]),
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matrix([1,0,-1])), pi),
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matrix([0.25, 0, -0.75]));
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approx.equal(atan2(0, 2) / pi, 0);
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approx.equal(atan2(0, -2) / pi, 1);
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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 () {atan2(1)}, error.ArgumentsError);
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assert.throws(function () {atan2(1, 2, 3)}, error.ArgumentsError);
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});
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}); |