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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/MovingAverage.java @ 4655:cd44d28d0fbc

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Move the access to artifact data to the Access object Use BedHeightAccess class to receive the data from the artifact. This abstracts the data access from the actual artifact.
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 11 Dec 2012 09:44:04 +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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d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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2
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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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;
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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5 import java.util.TreeMap;
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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6
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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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.
Raimund Renkert <rrenkert@intevation.de>
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9 {
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10
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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11 public static double[][] simple(double[][] values, double radius) {
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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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>
parents: 4630
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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>
parents: 4630
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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>
parents: 4630
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15 double [] ys = new double[N];
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16 int ndx = 0;
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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17 for (double x: map.keySet()) {
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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18 SortedMap<Double, Double> range =
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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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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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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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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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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25 xs[ndx] = x;
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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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.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4630
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29 return new double [][] { xs, ys };
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d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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30 }
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31
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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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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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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34 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>
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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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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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:
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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43 map.subMap(x-radius, false, x+radius, false).entrySet()
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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44 ) {
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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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45 double weight = 1d - Math.abs(x - e.getKey())*_1radius;
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46 avg += weight*e.getValue();
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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47 weights += weight;
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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48 }
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49 avg /= weights;
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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>
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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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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54 return new double [][] { xs, ys };
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55 }
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parents:
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56
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57 private static TreeMap<Double, Double> toMap(double[][] values) {
d6d16b5ab2f0 New class for average calculation implementing moving average algorithms.
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58 TreeMap<Double, Double> map = new TreeMap<Double, Double>();
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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>
parents: 4630
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59 double [] xs = values[0];
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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60 double [] ys = values[1];
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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61 for (int i = 0; i < xs.length; i++) {
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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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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