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Depending on the input vectors' dimensions, either a 1-d vector or a 2-d matrix should be returned.
53 lines
2.1 KiB
JavaScript
53 lines
2.1 KiB
JavaScript
var assert = require('assert');
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var error = require('../../../lib/error/index');
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var math = require('../../../index');
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describe('cross', function() {
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it('should calculate cross product for two arrays', function() {
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assert.deepEqual(math.cross([1, 1, 0], [0, 1, 1]), [1, -1, 1]);
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assert.deepEqual(math.cross([3, -3, 1], [4, 9, 2]), [-15, -2, 39]);
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assert.deepEqual(math.cross([2, 3, 4], [5, 6, 7]), [-3, 6, -3]);
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});
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it('should calculate cross product for two matrices', function() {
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assert.deepEqual(math.cross(math.matrix([1, 1, 0]), math.matrix([0, 1, 1])),
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math.matrix([1, -1, 1]));
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});
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it('should calculate cross product for mixed arrays and matrices', function() {
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assert.deepEqual(math.cross([1, 1, 0], math.matrix([0, 1, 1])),
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math.matrix([1, -1, 1]));
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assert.deepEqual(math.cross(math.matrix([1, 1, 0]), [0, 1, 1]),
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math.matrix([1, -1, 1]));
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});
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it('should calculate cross product for n-d arrays and matrices', function () {
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assert.deepEqual(math.cross([[1, 2, 3]], [[4, 5, 6]]), [[-3, 6, -3]]);
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assert.deepEqual(math.cross([[1], [2], [3]], [4, 5, 6]), [[-3, 6, -3]]);
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assert.deepEqual(math.cross([[[[1, 2, 3]]]], [[4, 5, 6]]), [[-3, 6, -3]]);
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});
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it('should throw an error for unsupported types of arguments', function() {
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assert.throws(function () {math.cross([2, 4, 1], 2)}, TypeError);
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});
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it('should throw an error for multi dimensional matrix input', function() {
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assert.throws(function () {math.cross([[1,2],[3,4]], [[1,2],[3,4]])}, /Vectors with length 3 expected/);
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});
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it('should throw an error in case of vectors with unequal length', function() {
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assert.throws(function () {math.cross([2, 3], [1,2,3])}, /Vectors with length 3 expected/);
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});
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it('should throw an error in case of empty vectors', function() {
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assert.throws(function () {math.cross([], [])}, /Vectors with length 3 expected/);
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});
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it('should LaTeX cross', function () {
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var expression = math.parse('cross([1],[2])');
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assert.equal(expression.toTex(), '\\left(\\begin{bmatrix}1\\\\\\end{bmatrix}\\right)\\times\\left(\\begin{bmatrix}2\\\\\\end{bmatrix}\\right)');
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});
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});
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