Java Array Sum Square sumSquaredError(double[] a, double[] b)

Description

Build the sum of the squared difference of all elements with the same index numbers in the arrays.

License

Open Source License

Parameter

Parameter	Description
a	a
b	a

Return

sum

Declaration

public static double sumSquaredError(double[] a, double[] b) 

Method Source Code

//package com.java2s;
/**//from w w  w . ja  v  a 2s.  c o m
 * Copyright 2004-2006 DFKI GmbH.
 * All Rights Reserved.  Use is subject to license terms.
 *
 * This file is part of MARY TTS.
 *
 * MARY TTS 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, version 3 of the License.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

public class Main {
    /**
     * Build the sum of the squared difference of all elements with the same index numbers in the arrays. Any NaN values in either
     * a or b are ignored in computing the error.
     * 
     * @param a
     *            a
     * @param b
     *            a
     * @return sum
     */
    public static double sumSquaredError(double[] a, double[] b) {
        if (a.length != b.length) {
            throw new IllegalArgumentException("Arrays must be equal length");
        }
        double sum = 0;
        for (int i = 0; i < a.length; i++) {
            double delta = a[i] - b[i];
            if (!Double.isNaN(delta)) {
                sum += delta * delta;
            }
        }
        return sum;
    }
}

Related

1. sumSq(double[] a)
2. sumSqual(byte[] b)
3. sumSquared(double[] data)
4. sumSquared(double[] data, double term)
5. SumSquared(Object in)
6. sumSquareDev(double[] values, double target)
7. sumSquareDoubleArray(double[] v)
8. sumSquares(double[] aArray)
9. sumSquares(double[] data)