Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/utils/DataUtil.java @ 3818:dc18457b1cef
merged flys-artifacts/pre2.7-2012-03-16
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:14:59 +0200 |
| parents | 8afd6a9bb244 |
| children | 5642a83420f2 |
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| 2456:60ab1054069d | 3818:dc18457b1cef |
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| 1 package de.intevation.flys.utils; | |
| 2 | |
| 3 import java.util.Random; | |
| 4 | |
| 5 import gnu.trove.TDoubleArrayList; | |
| 6 | |
| 7 public class DataUtil | |
| 8 { | |
| 9 public static boolean guessWaterIncreasing(TDoubleArrayList data) { | |
| 10 return guessWaterIncreasing(data, 0.05f); | |
| 11 } | |
| 12 | |
| 13 public static boolean guessWaterIncreasing(TDoubleArrayList data, float factor) { | |
| 14 int N = data.size(); | |
| 15 if (N < 2) return false; | |
| 16 | |
| 17 int samples = (int)(factor*N) + 1; | |
| 18 | |
| 19 int up = 0; | |
| 20 | |
| 21 Random rand = new Random(); | |
| 22 | |
| 23 for (int i = 0; i < samples; ++i) { | |
| 24 int pos2 = rand.nextInt(N-1) + 1; | |
| 25 int pos1 = rand.nextInt(pos2); | |
| 26 double w1 = data.getQuick(pos1); | |
| 27 double w2 = data.getQuick(pos2); | |
| 28 if (w2 > w1) ++up; | |
| 29 } | |
| 30 | |
| 31 return up > samples/2; | |
| 32 } | |
| 33 } | |
| 34 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |