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toolkit/javascript/d3/src/core/random.js
author Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
Thu, 10 Apr 2014 14:20:23 +0200
changeset 47 c0b4a8b5a012
permissions -rw-r--r--
add toolkit.html + démonstrateurs
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
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d3.random = {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
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  normal: function(mean, deviation) {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
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    if (arguments.length < 2) deviation = 1;
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parents:
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    if (arguments.length < 1) mean = 0;
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
parents:
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    return function() {
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parents:
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      var x, y, r;
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parents:
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      do {
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Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
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        x = Math.random() * 2 - 1;
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parents:
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        y = Math.random() * 2 - 1;
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        r = x * x + y * y;
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      } while (!r || r > 1);
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      return mean + deviation * x * Math.sqrt(-2 * Math.log(r) / r);
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    };
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  }
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};
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