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正規分布(標準ガウス分布)のランダム関数 - ボックス=ミューラー法 ref: http://qiita.com/sifue/items/e1dbfe671f42886e47d6
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/** | |
* 正規分布乱数関数 参考:http://d.hatena.ne.jp/iroiro123/20111210/1323515616 | |
* @param number m 平均μ | |
* @param number s 分散σ^2 | |
* @return number ランダムに生成された値 | |
*/ | |
var normRand = function (m, s) { | |
var a = 1 - Math.random(); | |
var b = 1 - Math.random(); | |
var c = Math.sqrt(-2 * Math.log(a)); | |
if(0.5 - Math.random() > 0) { | |
return c * Math.sin(Math.PI * 2 * b) * s + m; | |
}else{ | |
return c * Math.cos(Math.PI * 2 * b) * s + m; | |
} | |
}; |
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for (var i = 0; i < 100; i++) { | |
console.log(normRand(80, 5)); | |
}; |
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