Java mean mean(double[] aArray)

Description

Computes the arithmetic mean of the values in the given array.

License

Open Source License

Parameter

Parameter	Description
aArray	Array of numbers.

Exception

Parameter	Description
NullPointerException	If <code>aArray</code> is <code>null</code>.

Return

Mean of all values in aArray; 0 if aArray is empty.

Declaration

public static double mean(double[] aArray) 

Method Source Code

//package com.java2s;
/*// w ww  .ja  v a2  s. com
 * #%L
 * Cytoscape NetworkAnalyzer Impl (network-analyzer-impl)
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2006 - 2013
 *   Max Planck Institute for Informatics, Saarbruecken, Germany
 *   The Cytoscape Consortium
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as 
 * published by the Free Software Foundation, either version 2.1 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-2.1.html>.
 * #L%
 */

public class Main {
    /**
     * Computes the arithmetic mean of the values in the given array.
     * 
     * @param aArray Array of numbers.
     * @return Mean of all values in <code>aArray</code>; <code>0</code> if <code>aArray</code>
     *         is empty.
     * 
     * @throws NullPointerException If <code>aArray</code> is <code>null</code>.
     */
    public static double mean(double[] aArray) {
        return sum(aArray) / aArray.length;
    }

    /**
     * Computes the sum of all values in the given array.
     * 
     * @param aArray Array of numbers.
     * @return Sum of all values in <code>aArray</code>; <code>0</code> if <code>aArray</code>
     *         is empty.
     * 
     * @throws NullPointerException If <code>aArray</code> is <code>null</code>.
     */
    public static double sum(double[] aArray) {
        double result = 0;
        for (final double a : aArray) {
            result += a;
        }
        return result;
    }
}

Related

1. mean(double[] a)
2. mean(double[] a, double[] b)
3. mean(double[] a, double[] b)
4. mean(double[] a, int from, int to)
5. mean(double[] a, int n)
6. mean(double[] an)
7. mean(double[] arr)
8. mean(Double[] array)
9. mean(double[] array)