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<!DOCTYPE html>
<html>
<head>
<style>
body {
font-size: 30px;
}
</style>
</head>
<body>
<div></div>
<script>
function Matrix(ary) {
this.mtx = ary
this.height = ary.length;
this.width = ary[0].length;
}
Matrix.prototype.toString = function() {
var s = []
for (var i = 0; i < this.mtx.length; i++)
s.push( this.mtx[i].join(",") );
return s.join("\n");
}
Matrix.prototype.mult = function(other) {
if (this.width != other.height) {
throw "error: incompatible sizes";
}
var result = [];
for (var i = 0; i < this.height; i++) {
result[i] = [];
for (var j = 0; j < other.width; j++) {
var sum = 0;
for (var k = 0; k < this.width; k++) {
sum += this.mtx[i][k] * other.mtx[k][j];
}
result[i][j] = sum;
}
}
return new Matrix(result);
}
function run() {
var elems = [];
for (var i = 0; i < 900; i++) {
elems.push(i);
}
var outer = [];
for (var i = 0; i < 900; i++) {
outer.push(elems);
}
var a = new Matrix(outer);
var b = new Matrix(outer);
var result = a.mult(b);
}
function say(msg) {
var div = document.getElementsByTagName('div')[0];
var text = document.createTextNode(msg);
var p = document.createElement("p");
p.appendChild(text);
div.appendChild(p);
}
//say("multiplying 900x900 matrix");
setTimeout(function forever() {
var now = new Date();
run();
say("mult 900x900 in " + (new Date() - now));
setTimeout(forever, 5000);
}, 1000);
</script>
</body>
</html>
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