Skip to content

Instantly share code, notes, and snippets.

@skagedal

skagedal/test_pickRandom.html

Created January 29, 2012 22:19
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save skagedal/1701014 to your computer and use it in GitHub Desktop.
Save skagedal/1701014 to your computer and use it in GitHub Desktop.
Download ZIP
Speed testing and "fair coin" testing for pickRandom
Raw
test_pickRandom.html
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="underscore.js"></script>
<script type="text/javascript">
function time(s, f) {
start = new Date();
f();
end = new Date();
$("#speedtest").append(s + ": " + String(end - start) + " ms<br />");
}
function testSpeed () {
var k = 10;
var n = 10000;
var times = 1000;
var a = _.range(n);
var b = _.range(n * 2);
time("picking with shuffle, size n", function () {
_.times(times, function () { _.first(_.shuffle(a), k); });
});
time("picking with shuffle, size n*2", function () {
_.times(times, function () { _.first(_.shuffle(b), k); });
});
time("picking with pickRandom, size n", function () {
_.times(times, function () { _.pickRandom(a, k); });
});
time("picking with pickRandom, size n*2", function () {
_.times(times, function () { _.pickRandom(b, k); });
});
$("#running").hide();
}
COIN = {tosses: 0, heads: 0, coin: []};
function initCoin() {
var i;
for (i = 0; i < 100; i++) {
COIN.coin.push(0);
}
for (i = 0; i < 100; i++) {
COIN.coin.push(1);
}
}
function testFairCoin() {
for (var i = 0; i < 10000; i++) {
pick = _.pickRandom(COIN.coin, COIN.coin.length / 2);
heads = _.reduce(pick, function (a, b) { return a + b; }, 0);
COIN.tosses += pick.length;
COIN.heads += heads;
}
$("#tosses").html(COIN.tosses);
$("#heads").html(COIN.heads);
$("#propo").html(COIN.heads / COIN.tosses);
}
function main() {
_.defer(testSpeed);
initCoin();
$("#testcoin").click(testFairCoin);
}
$(main);
</script>
</head>
<body>
<p id="speedtest">Speed test <span id="running">(running)</span>:<br/>
<p><button id="testcoin">Test coin</button></p>
<p>Tosses: <span id="tosses"></span></p>
<p>Heads: <span id="heads"></span></p>
<p>Proportion: <span id="propo"></span></p>
</body>
</html>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment