Mercurial > dive4elements > river
view artifacts/src/main/java/org/dive4elements/river/utils/DataUtil.java @ 8581:073ea4bcea58
(issue1755) Interpolate BedQuality Results
This adds an interpolation function to each various bedQuality result class.
Imho this is ok as the interpolation function can be seen as part of the result.
The interpolation function is initalized on first use and can be accessed through
get.*Interpol functions.
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Mon, 16 Mar 2015 15:36:38 +0100 |
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 :