Java Array Average avg(double[] a)

Description

Average or mean value of array

License

Open Source License

Declaration

public static double avg(double[] a) 

Method Source Code

//package com.java2s;
/*/*from  w ww . j  a  v  a2s  .  co  m*/
 * This file is part of TiPi (a Toolkit for Inverse Problems and Imaging)
 * developed by the MitiV project.
 *
 * Copyright (c) 2014 the MiTiV project, http://mitiv.univ-lyon1.fr/
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

public class Main {
    /**
     * Average or mean value of array
     */
    public static double avg(double[] a) {
        return sum(a) / (a.length);
    }

    /**
     * Average or mean value of array
     */
    public static double avg(long[] a) {
        return sum(a) / (a.length);
    }

    /**
     * Average or mean value of array
     */
    public static double avg(double[][] a) {
        int H = a.length;
        int W = a[0].length;
        return sum(a) / (H * W);
    }

    /**
     * Average or mean value of array
     */
    public static double avg(double[][][] a) {
        int W = a.length;
        int H = a[0].length;
        int D = a[0][0].length;
        return sum(a) / (D * H * W);
    }

    /**
     * Sum of the values in the array
     */
    public static double sum(double a[]) {
        int size = a.length;
        double sum = 0;
        for (int i = 0; i < size; i++) {
            sum += a[i];
        }
        return sum;
    }

    /**
     * Sum of the values in the array
     */
    public static double sum(double a[], int begin, int end) {
        double sum = 0;
        for (int i = begin; i <= end; i++) {
            sum += a[i];
        }
        return sum;
    }

    /**
     * Sum of the values in the array
     */
    public static long sum(long array[]) {
        int size = array.length;
        long sum = 0;
        for (int i = 0; i < size; i++) {
            sum += array[i];
        }
        return sum;
    }

    /**
     * Sum of the values in the array
     */
    public static double sum(double array[][]) {
        int H = array.length;
        double sum = 0;
        for (int i = 0; i < H; i++) {
            sum += sum(array[i]);
        }
        return sum;
    }

    /**
     * Sum of the values in the array
     */
    public static double sum(double array[][][]) {
        int D = array.length;
        double sum = 0;
        for (int k = 0; k < D; k++) {
            sum += sum(array[k]);
        }
        return sum;
    }
}

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