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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/MovingAverage.java @ 4709:e50d78334246

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Documentation.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 19 Dec 2012 11:40:56 +0100
parents d35d316049e8
children fb9892036bd6
rev   line source
4630
63368dcc3f94 Moved MovingAverage into math package
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4625
diff changeset
1 package de.intevation.flys.artifacts.math;
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2
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3 import java.util.Map;
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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4 import java.util.SortedMap;
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5 import java.util.TreeMap;
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6
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7
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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8 public class MovingAverage
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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9 {
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10
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11 public static double[][] simple(double[][] values, double radius) {
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12 TreeMap<Double, Double> map = toMap(values);
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d35d316049e8 A little optimization and handle the case that there are duplicates in the values.
Sascha L. Teichmann <teichmann@intevation.de>
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13 int N = map.size();
d35d316049e8 A little optimization and handle the case that there are duplicates in the values.
Sascha L. Teichmann <teichmann@intevation.de>
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14 double [] xs = new double[N];
d35d316049e8 A little optimization and handle the case that there are duplicates in the values.
Sascha L. Teichmann <teichmann@intevation.de>
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15 double [] ys = new double[N];
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16 int ndx = 0;
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17 for (double x: map.keySet()) {
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18 SortedMap<Double, Double> range =
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19 map.subMap(x-radius, true, x+radius, true);
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20 double avg = 0d;
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21 for (double v: range.values()) {
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22 avg += v;
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23 }
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24 avg /= range.size();
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25 xs[ndx] = x;
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26 ys[ndx] = avg;
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27 ndx++;
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28 }
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d35d316049e8 A little optimization and handle the case that there are duplicates in the values.
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29 return new double [][] { xs, ys };
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30 }
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31
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32 public static double[][] weighted(double[][] values, double radius) {
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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33 TreeMap<Double, Double> map = toMap(values);
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Sascha L. Teichmann <teichmann@intevation.de>
parents: 4630
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34 int N = map.size();
d35d316049e8 A little optimization and handle the case that there are duplicates in the values.
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parents: 4630
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35 double [] xs = new double[N];
d35d316049e8 A little optimization and handle the case that there are duplicates in the values.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4630
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36 double [] ys = new double[N];
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37 int ndx = 0;
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Sascha L. Teichmann <teichmann@intevation.de>
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38 double _1radius = 1d/radius;
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39 for (double x: map.keySet()) {
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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40 double avg = 0d;
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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41 double weights = 0d;
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42 for (Map.Entry<Double, Double> e:
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43 map.subMap(x-radius, false, x+radius, false).entrySet()
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44 ) {
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d35d316049e8 A little optimization and handle the case that there are duplicates in the values.
Sascha L. Teichmann <teichmann@intevation.de>
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45 double weight = 1d - Math.abs(x - e.getKey())*_1radius;
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46 avg += weight*e.getValue();
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47 weights += weight;
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48 }
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49 avg /= weights;
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parents: 4630
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50 xs[ndx] = x;
d35d316049e8 A little optimization and handle the case that there are duplicates in the values.
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parents: 4630
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51 ys[ndx] = avg;
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52 ndx++;
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53 }
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parents: 4630
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54 return new double [][] { xs, ys };
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55 }
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56
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57 private static TreeMap<Double, Double> toMap(double[][] values) {
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58 TreeMap<Double, Double> map = new TreeMap<Double, Double>();
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Sascha L. Teichmann <teichmann@intevation.de>
parents: 4630
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59 double [] xs = values[0];
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60 double [] ys = values[1];
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61 for (int i = 0; i < xs.length; i++) {
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62 map.put(xs[i], ys[i]);
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63 }
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64 return map;
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65 }
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66 }
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