Java examples for java.lang:Math Algorithm
standard deviation on double type array
//package com.java2s; public class Main { public static double std_dev(double a[]) { double sum = 0; double sq_sum = 0; for (int i = 0; i < a.length; ++i) { sum += a[i];//from w w w .j av a2 s .co m } double mean = sum / a.length; for (int i = 0; i < a.length; ++i) { sq_sum += Math.pow(a[i] - mean, 2); } sq_sum = sq_sum / (a.length); return Math.sqrt(sq_sum); } }