Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/utils/DataUtil.java @ 7261:a56fe3bc6700
Refactoring: Let RiverAccess.getRiver return an River.
Renamed getRiver in getRiverName. Update Callers.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Tue, 08 Oct 2013 14:50:58 +0200 |
parents | 3c4efd4b2c19 |
children | 5e38e2924c07 |
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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 guessDataIncreasing(TDoubleArrayList data) { |
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18 return guessDataIncreasing(data, 0.05f); |
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19 } |
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20 |
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21 /** Guess if data1 and data2 both grow in the same direction */ |
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22 public static boolean guessSameDirectionData(TDoubleArrayList data1, |
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23 TDoubleArrayList data2) { |
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24 boolean d1dir = DataUtil.guessDataIncreasing(data1, 0.05f); |
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25 boolean d2dir = DataUtil.guessDataIncreasing(data2, 0.05f); |
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26 int size = data1.size(); |
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27 return ((d1dir && d2dir) || (!d1dir && !d2dir)) && size > 1; |
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28 } |
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29 |
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30 public static boolean guessDataIncreasing(TDoubleArrayList data, float factor) { |
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31 int N = data.size(); |
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32 if (N < 2) return false; |
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33 |
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34 int samples = (int)(factor*N) + 1; |
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35 |
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36 int up = 0; |
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37 |
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38 Random rand = new Random(); |
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39 |
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40 for (int i = 0; i < samples; ++i) { |
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41 int pos2 = rand.nextInt(N-1) + 1; |
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42 int pos1 = rand.nextInt(pos2); |
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43 double w1 = data.getQuick(pos1); |
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44 double w2 = data.getQuick(pos2); |
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45 if (w2 > w1) ++up; |
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46 } |
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47 |
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48 return up > samples/2; |
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49 } |
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50 } |
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51 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |