Java Array Normalize normalizeHistogram(int[] hist)

Description

normalizes histogram in hist to produce ratios of each position to total sum

License

Apache License

Declaration

public static double[] normalizeHistogram(int[] hist) 

Method Source Code

//package com.java2s;
/*//from w ww. j  ava 2  s  .  com
 Copyright (C) 2012 The Stanford MobiSocial Laboratory
    
   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 {
    /** normalizes histogram in hist to produce ratios of each position to total sum */
    public static double[] normalizeHistogram(int[] hist) {
        int sum = 0;
        for (int i : hist)
            sum += i;
        return normalizeHistogramToBase(hist, sum);
    }

    /** returns histogram counts divided by given base */
    public static double[] normalizeHistogramToBase(int[] hist, double base) {
        double[] result = new double[hist.length];
        for (int i = 0; i < hist.length; i++)
            result[i] = (base == 0) ? 0.0 : ((double) hist[i]) / base;

        return result;
    }
}

Related

1. normalizeFromLog10(final double[] array, final boolean takeLog10OfOutput, final boolean keepInLogSpace)
2. normalizeFromRealSpace(final double[] array)
3. normalizeHeightMap(float heightMap[])
4. normalizeHeightMapCopy(float heightMap[])
5. normalizeHistogram(int[] h)
6. normalizeHistogramToBase(int[] hist, double base)
7. normalizeInnerPointDistanceMax(double[][] distances, double maxDist)
8. normalizeL2(double[] a)
9. normalizeL2(double[] histogram)