Java Euclidean euclideanNormSquared(double[] x1, double[] x2)

Description

Computing the norm as the Euclidean norm squared (i.e.

License

Open Source License

Parameter

Parameter	Description
x1	a parameter
x2	a parameter

Declaration

public static double euclideanNormSquared(double[] x1, double[] x2) 

Method Source Code

//package com.java2s;
/*//from w ww . j  a va 2s .  c o m
 *  Java Information Dynamics Toolkit (JIDT)
 *  Copyright (C) 2012, Joseph T. Lizier
 *  
 *  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/>.
 */

public class Main {
    /**
     * Computing the norm as the Euclidean norm squared
     *  (i.e. avoids taking the square root).
     * 
     * @param x1
     * @param x2
     * @return
     */
    public static double euclideanNormSquared(double[] x1, double[] x2) {
        double distance = 0.0;
        for (int d = 0; d < x1.length; d++) {
            double difference = x1[d] - x2[d];
            distance += difference * difference;
        }
        return distance;
    }
}

Related

1. euclideanGCD(final long firstNumerator, final long secondNumerator)
2. euclideanGcd(long a, long b)
3. euclideanLength(double[] vector)
4. euclideanMod(final float x, final float y)
5. euclideanNorm(float vector[])