Merged revisions 4539-4540,4543,4545-4546 via svnmerge from file:///home/clients/bsh/bsh-generischer-viewer/Material/SVN/flys-artifacts/trunk ........ r4539 | teichmann | 2012-05-27 20:02:13 +0200 (So, 27 Mai 2012) | 1 line FixA: Added forgotten csv/report facets/generators to conf. ........ r4540 | teichmann | 2012-05-27 20:11:31 +0200 (So, 27 Mai 2012) | 1 line FixA: Fixed class cast bug in report facet. ........ r4543 | teichmann | 2012-05-28 20:35:01 +0200 (Mo, 28 Mai 2012) | 1 line FixA: Added facet to return delta w/t as CSV ........ r4545 | teichmann | 2012-05-28 22:59:27 +0200 (Mo, 28 Mai 2012) | 1 line FixA: Made Delta W/t calculation finally work ........ r4546 | teichmann | 2012-05-28 23:34:24 +0200 (Mo, 28 Mai 2012) | 1 line FixA: corrected fitting (Q->W instead W->Q). ........ flys-artifacts/tags/2.7@4547 c6561f87-3c4e-4783-a992-168aeb5c3f6f

package de.intevation.flys.utils;

import java.util.Random;

import gnu.trove.TDoubleArrayList;

public class DataUtil
{
    public static boolean guessWaterIncreasing(TDoubleArrayList data) {
        return guessWaterIncreasing(data, 0.05f);
    }

    public static boolean guessWaterIncreasing(TDoubleArrayList data, float factor) {
        int N = data.size();
        if (N < 2) return false;
    
        int samples = (int)(factor*N) + 1;
    
        int up = 0;
    
        Random rand = new Random();
    
        for (int i = 0; i < samples; ++i) {
            int    pos2 = rand.nextInt(N-1) + 1;
            int    pos1 = rand.nextInt(pos2);
            double w1   = data.getQuick(pos1);
            double w2   = data.getQuick(pos2);
            if (w2 > w1) ++up;
        }
    
        return up > samples/2;
    }
}
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