Mercurial > dive4elements > river
view artifacts/src/main/java/org/dive4elements/river/artifacts/math/MovingAverage.java @ 6693:88bb0c794833
issue1391: Enable GaugeDischarge artifact to directly load a table by its ID
This allows us to use the GaugeDischargeArtifact for any discharge
tables that we have in our database. The name of the created facet
is taken from the ids string as is also usual in the WMS artifacts.
author | Andre Heinecke <aheinecke@intevation.de> |
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date | Mon, 29 Jul 2013 12:19:57 +0200 |
parents | af13ceeba52a |
children | 34c15927f9d9 |
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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.artifacts.math; import java.util.Map; import java.util.SortedMap; import java.util.TreeMap; public class MovingAverage { public static double[][] simple(double[][] values, double radius) { TreeMap<Double, Double> map = toMap(values); int N = map.size(); double [] xs = new double[N]; double [] ys = new double[N]; int ndx = 0; for (double x: map.keySet()) { SortedMap<Double, Double> range = map.subMap(x-radius, true, x+radius, true); double avg = 0d; for (double v: range.values()) { avg += v; } avg /= range.size(); xs[ndx] = x; ys[ndx] = avg; ndx++; } return new double [][] { xs, ys }; } public static double[][] weighted(double[][] values, double radius) { TreeMap<Double, Double> map = toMap(values); int N = map.size(); double [] xs = new double[N]; double [] ys = new double[N]; int ndx = 0; double _1radius = 1d/radius; for (double x: map.keySet()) { double avg = 0d; double weights = 0d; for (Map.Entry<Double, Double> e: map.subMap(x-radius, false, x+radius, false).entrySet() ) { double weight = 1d - Math.abs(x - e.getKey())*_1radius; avg += weight*e.getValue(); weights += weight; } avg /= weights; xs[ndx] = x; ys[ndx] = avg; ndx++; } return new double [][] { xs, ys }; } private static TreeMap<Double, Double> toMap(double[][] values) { TreeMap<Double, Double> map = new TreeMap<Double, Double>(); double [] xs = values[0]; double [] ys = values[1]; for (int i = 0; i < xs.length; i++) { map.put(xs[i], ys[i]); } return map; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :