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45 lines
1.6 KiB
JavaScript
45 lines
1.6 KiB
JavaScript
var assert = require('assert');
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var math = require('../../../lib/index.js');
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describe('arg', function() {
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it('should compute the argument of a complex number correctly', function() {
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assert.equal(math.arg(math.complex('0')) / math.pi, 0);
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assert.equal(math.arg(math.complex('1 + 0i')) / math.pi, 0);
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assert.equal(math.arg(math.complex('1 + i')) / math.pi, 0.25);
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assert.equal(math.arg(math.complex('0 + i')) / math.pi, 0.5);
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assert.equal(math.arg(math.complex('-1 + i')) / math.pi, 0.75);
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assert.equal(math.arg(math.complex('-1 + 0i')) / math.pi, 1);
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assert.equal(math.arg(math.complex('-1 - i')) / math.pi, -0.75);
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assert.equal(math.arg(math.complex('0 - i')) / math.pi, -0.5);
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assert.equal(math.arg(math.complex('1 - i')) / math.pi, -0.25);
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assert.equal(math.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(math.arg([
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math.i, math.unary(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(math.arg([
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math.i, math.unary(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(math.arg(2) / math.pi, 0);
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assert.equal(math.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 () {math.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 () {math.arg(math.unit('5cm'))});
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});
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}); |