JavaScript 平均值v1.0

Posted 2021-05-20

/*
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* average Function v1.0              *
* Autor: Carlos R. L. Rodrigues      *
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*/
average = function(a){
    var r = {mean: 0, variance: 0, deviation: 0}, t = a.length;
    for(var m, s = 0, l = t; l--; s += a[l]);
    for(m = r.mean = s / t, l = t, s = 0; l--; s += Math.pow(a[l] - m, 2));
    return r.deviation = Math.sqrt(r.variance = s / t), r;
}