Computes the weighted mean. - Java java.lang

Java examples for java.lang:Math Algorithm

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Description

Computes the weighted mean.

Demo Code

/*//from ww  w. j av a2s  .c  o m
 * Copyright (C) 2011 apurv
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
//package com.java2s;

import java.util.Vector;

public class Main {
    /**
     * Computes the weighted mean.
     * @param tPosVector
     * @param wVector
     * @return 
     */
    private static double computeWeightedMean(Vector<Double> tPosVector,
            Vector<Double> wVector) {
        double meanPos = 0.0;
        double sum = 0.0;
        double sumW = 0.0;

        for (int i = 0; i <= tPosVector.size() - 1; i++) {
            Double position = tPosVector.elementAt(i);
            Double weight = wVector.elementAt(i);
            sum += position * weight;
            sumW += weight;
        }
        meanPos = sum / sumW;
        return meanPos;
    }
}

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