Mercurial > dive4elements > river
view artifacts/src/main/java/org/dive4elements/river/utils/DataUtil.java @ 8755:30b1ddadf275
(issue1801) Unify reference gauge finding code
The basic way as described in the method comment of the
determineRefGauge method is now used in the WINFOArtifact,
MainValuesService and RiverUtils.getGauge method.
RiverUtils.getGauge previously just returned the first
gauge found. While this is now a behavior change I believe
that it is always more correct then the undeterministic
behavior of the previous implmenentation.
author | Andre Heinecke <andre.heinecke@intevation.de> |
---|---|
date | Wed, 24 Jun 2015 14:07:26 +0200 |
parents | 3c4efd4b2c19 |
children | 5e38e2924c07 |
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/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde * Software engineering by Intevation GmbH * * This file is Free Software under the GNU AGPL (>=v3) * and comes with ABSOLUTELY NO WARRANTY! Check out the * documentation coming with Dive4Elements River for details. */ package org.dive4elements.river.utils; import java.util.Random; import gnu.trove.TDoubleArrayList; public class DataUtil { public static boolean guessDataIncreasing(TDoubleArrayList data) { return guessDataIncreasing(data, 0.05f); } /** Guess if data1 and data2 both grow in the same direction */ public static boolean guessSameDirectionData(TDoubleArrayList data1, TDoubleArrayList data2) { boolean d1dir = DataUtil.guessDataIncreasing(data1, 0.05f); boolean d2dir = DataUtil.guessDataIncreasing(data2, 0.05f); int size = data1.size(); return ((d1dir && d2dir) || (!d1dir && !d2dir)) && size > 1; } public static boolean guessDataIncreasing(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; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :