Created
August 12, 2011 14:22
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An example of Matrix mulitplication in JavaScript
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| <!DOCTYPE html> | |
| <html> | |
| <!-- | |
| Created using JS Bin | |
| Source can be edited via /aludec/latest/edit | |
| --> | |
| <head> | |
| <meta charset=utf-8 /> | |
| <title>Matrix Multiply</title> | |
| <!--[if IE]> | |
| <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script> | |
| <![endif]--> | |
| <style> | |
| article, aside, figure, footer, header, hgroup, | |
| menu, nav, section { display: block; } | |
| </style> | |
| </head> | |
| <body> | |
| <p id="hello">Hello World</p> | |
| <script> | |
| var getMatrix = (function(){ | |
| var toString = function(f){ | |
| return f ? f(this) : 'matrix'; | |
| }; | |
| var multiply = function(m){ | |
| var a = [[0,0,0],[0,0,0],[0,0,0]]; | |
| var i, j, k; | |
| for(i = 0; i < 3; i += 1) { | |
| for(j = 0; j < 3; j += 1) { | |
| for(k = 0; k < 3; k += 1) { | |
| a[i][j] += this.a[k][i] * m.a[j][k]; | |
| } | |
| } | |
| } | |
| return getMatrix(a); | |
| }; | |
| return function getMatrix(a) { | |
| return { | |
| 'a': a, | |
| 'multiply': multiply, | |
| 'toString': toString | |
| }; | |
| }; | |
| }()); | |
| var htmlStringify = function(m) { | |
| var s = ''; | |
| s = s + '[' + m.a[0][0] + ', ' + m.a[0][1] + ', ' + m.a[0][2] + ']'; | |
| s = s + '</br>'; | |
| s = s + '[' + m.a[1][0] + ', ' + m.a[1][1] + ', ' + m.a[1][2] + ']'; | |
| s = s + '</br>'; | |
| s = s + '[' + m.a[2][0] + ', ' + m.a[2][1] + ', ' + m.a[2][2] + ']'; | |
| return s; | |
| }; | |
| var cos = Math.cos(Math.PI / 4); | |
| var sin = Math.sin(Math.PI / 4); | |
| var m = getMatrix([ | |
| [ cos, sin, 0], | |
| [-sin, cos, 0], | |
| [ 0 , 0 , 1] | |
| ]); | |
| var n = getMatrix([ | |
| [cos, -sin, 0], | |
| [sin, cos, 0], | |
| [ 0 , 0 , 1] | |
| ]); | |
| var x = m.multiply(n); | |
| document.getElementById('hello').innerHTML = x.toString(htmlStringify); | |
| </script> | |
| </body> | |
| </html> |
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