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annotate artifacts/src/main/java/org/dive4elements/river/utils/DataUtil.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children af13ceeba52a
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
diff changeset
1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.utils;
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10
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11 import java.util.Random;
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12
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13 import gnu.trove.TDoubleArrayList;
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14
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15 public class DataUtil
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16 {
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17 public static boolean guessWaterIncreasing(TDoubleArrayList data) {
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18 return guessWaterIncreasing(data, 0.05f);
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19 }
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20
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21 public static boolean guessWaterIncreasing(TDoubleArrayList data, float factor) {
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22 int N = data.size();
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23 if (N < 2) return false;
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24
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25 int samples = (int)(factor*N) + 1;
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26
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27 int up = 0;
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28
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29 Random rand = new Random();
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30
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31 for (int i = 0; i < samples; ++i) {
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32 int pos2 = rand.nextInt(N-1) + 1;
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33 int pos1 = rand.nextInt(pos2);
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34 double w1 = data.getQuick(pos1);
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35 double w2 = data.getQuick(pos2);
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36 if (w2 > w1) ++up;
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37 }
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38
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39 return up > samples/2;
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40 }
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41 }
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8afd6a9bb244 Cosmetics.
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42 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org