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Conflicts: HISTORY.md bower.json component.json dist/math.js dist/math.map dist/math.min.js lib/function/arithmetic/abs.js lib/function/probability/gamma.js lib/version.js package.json
77 lines
2.6 KiB
JavaScript
77 lines
2.6 KiB
JavaScript
var assert = require('assert');
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var approx = require('../../../tools/approx');
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var math = require('../../../index');
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var arg = math.arg;
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describe('arg', function() {
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it('should compute the argument of a boolean', function () {
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assert.equal(arg(true), 0);
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assert.equal(arg(false), 0);
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});
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it('should compute the argument of null', function () {
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assert.equal(arg(null), 0);
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});
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it('should compute the argument of a number', function () {
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assert.equal(arg(1), 0);
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assert.equal(arg(2), 0);
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assert.equal(arg(0), 0);
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approx.equal(arg(-2), 3.141592653589793);
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});
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it('should compute the argument of a bignumber (downgrades to number)', function () {
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assert.equal(arg(math.bignumber(1)), 0);
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});
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it('should compute the argument of a complex number correctly', function() {
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assert.equal(arg(math.complex('0')) / math.pi, 0);
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assert.equal(arg(math.complex('1 + 0i')) / math.pi, 0);
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assert.equal(arg(math.complex('1 + i')) / math.pi, 0.25);
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assert.equal(arg(math.complex('0 + i')) / math.pi, 0.5);
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assert.equal(arg(math.complex('-1 + i')) / math.pi, 0.75);
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assert.equal(arg(math.complex('-1 + 0i')) / math.pi, 1);
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assert.equal(arg(math.complex('-1 - i')) / math.pi, -0.75);
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assert.equal(arg(math.complex('0 - i')) / math.pi, -0.5);
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assert.equal(arg(math.complex('1 - i')) / math.pi, -0.25);
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assert.equal(arg(math.i) / math.pi, 0.5);
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});
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it('should calculate the argument for each element in a matrix', function() {
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assert.deepEqual(math.divide(arg([
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math.i, math.unaryMinus(math.i), math.add(1,math.i)
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]), math.pi), [
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0.5, -0.5, 0.25
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]);
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assert.deepEqual(math.matrix(math.divide(arg([
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math.i, math.unaryMinus(math.i), math.add(1,math.i)
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]), math.pi)).valueOf(), [
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0.5, -0.5, 0.25
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]);
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});
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it('should compute the argument of a real number correctly', function() {
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assert.equal(arg(2) / math.pi, 0);
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assert.equal(arg(-2) / math.pi, 1);
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});
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it('should throw an error if used with a string', function() {
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assert.throws(function () {arg('string')});
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});
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it('should throw an error if used with a unit', function() {
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assert.throws(function () {arg(math.unit('5cm'))});
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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 () {arg()}, /TypeError: Too few arguments/);
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assert.throws(function () {arg(1, 2)}, /TypeError: Too many arguments/);
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});
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it('should LaTeX arg', function () {
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var expression = math.parse('arg(1+i)');
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assert.equal(expression.toTex(), '\\arg\\left(1+ i\\right)');
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});
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});
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