Here you can find the source of mean(List
public static double mean(List<Double> vals)
//package com.java2s; /*// www .ja v a 2 s .c o m * AACalc - Asset Allocation Calculator * Copyright (C) 2009, 2011-2016 Gordon Irlam * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.util.List; public class Main { public static double mean(List<Double> vals) { return sum(vals) / vals.size(); } public static double mean(double... a) { return sum(a) / a.length; } public static double sum(double... vals) { double x = 0.0; double floor = (vals.length == 0 || Double.isInfinite(vals[0]) ? 0 : vals[0]); // Avoid loss of precision summing many large nearby values. for (Double val : vals) { x += val - floor; } return vals.length * floor + x; } public static double sum(List<Double> vals) { double x = 0.0; double floor = (vals.size() == 0 || Double.isInfinite(vals.get(0)) ? 0 : vals.get(0)); // Avoid loss of precision summing many large nearby values. for (double val : vals) { x += val - floor; } return vals.size() * floor + x; } }