Java Array Normalize normalize(double[] a)

Description

L1 normalization

License

Apache License

Parameter

Parameter	Description
a	a parameter

Declaration

public static void normalize(double[] a) 

Method Source Code

//package com.java2s;
/**/*  ww  w . j  a v a 2s .  c o  m*/
 * 
 *    Copyright 2017 Florian Erhard
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * 
 */

public class Main {
    /**
     * L1 normalization
     * @param a
     */
    public static void normalize(double[] a) {
        double sum = 0;
        for (double x : a)
            sum += x;
        if (sum == 0)
            for (int i = 0; i < a.length; i++)
                a[i] = 1 / a.length;
        else
            for (int i = 0; i < a.length; i++)
                a[i] /= sum;
    }

    /**
     * L1 normalization
     * @param a
     */
    public static void normalize(float[] a) {
        float sum = 0;
        for (float x : a)
            sum += x;
        for (int i = 0; i < a.length; i++)
            a[i] /= sum;
    }

    /**
     * L1 normalization
     * @param a
     */
    public static void normalize(float[][] a) {
        double sum = 0;
        for (float[] a2 : a)
            for (float f : a2)
                sum += f;
        for (float[] a2 : a)
            for (int i = 0; i < a2.length; i++)
                a2[i] /= sum;
    }

    /**
     * L1 normalization
     * @param a
     */
    public static void normalize(double[][] a) {
        double sum = 0;
        for (double[] a2 : a)
            for (double f : a2)
                sum += f;
        for (double[] a2 : a)
            for (int i = 0; i < a2.length; i++)
                a2[i] /= sum;
    }
}

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