Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/App.java @ 5831:bd047b71ab37
Repaired internal references
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Thu, 25 Apr 2013 12:06:39 +0200 |
parents | flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/App.java@5642a83420f2 |
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rev | line source |
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5831
bd047b71ab37
Repaired internal references
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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1 package org.dive4elements.river.artifacts.math.fitting; |
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2 |
0dd58ab7e118
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3 import java.util.List; |
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4 import java.util.Map; |
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5 import java.util.ArrayList; |
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6 import java.util.TreeMap; |
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7 import java.util.Comparator; |
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8 |
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9 import java.io.IOException; |
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10 import java.io.BufferedReader; |
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11 import java.io.Reader; |
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12 import java.io.InputStreamReader; |
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13 |
0dd58ab7e118
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14 import org.apache.commons.math.optimization.fitting.CurveFitter; |
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15 |
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16 import org.apache.commons.math.optimization.general.LevenbergMarquardtOptimizer; |
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17 |
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18 import org.apache.commons.math.MathException; |
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19 |
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20 public class App |
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21 { |
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22 public static final double EPS = 1e-5; |
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23 |
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24 public static final String FUNCTION_NAME = |
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25 System.getProperty("function", "linear"); |
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26 |
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27 public static final Comparator<Double> EPS_CMP = |
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28 new Comparator<Double>() { |
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29 @Override |
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30 public int compare(Double a, Double b) { |
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31 double diff = a - b; |
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32 if (diff < -EPS) return -1; |
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33 if (diff > EPS) return +1; |
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34 return 0; |
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35 } |
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36 }; |
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37 |
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38 public static final List<Double []>readPoints(Reader reader) |
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39 throws IOException |
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40 { |
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41 Map<Double, Double> map = new TreeMap<Double, Double>(EPS_CMP); |
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42 |
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43 BufferedReader input = new BufferedReader(reader); |
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44 |
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45 String line; |
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46 while ((line = input.readLine()) != null) { |
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47 if ((line = line.trim()).length() == 0 || line.startsWith("#")) { |
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48 continue; |
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49 } |
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50 |
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51 String [] parts = line.split("\\s+"); |
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52 |
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53 if (parts.length < 2) { |
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54 continue; |
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55 } |
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56 |
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57 try { |
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58 Double x = Double.valueOf(parts[0]); |
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59 Double y = Double.valueOf(parts[1]); |
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60 |
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61 Double old = map.put(x, y); |
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62 |
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63 if (old != null) { |
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64 System.err.println("duplicate x: " + x); |
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65 } |
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66 } |
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67 catch (NumberFormatException nfe) { |
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68 nfe.printStackTrace(); |
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69 } |
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70 } |
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71 |
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72 List<Double []> list = new ArrayList<Double []>(map.size()); |
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73 |
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74 for (Map.Entry<Double, Double> entry: map.entrySet()) { |
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75 list.add(new Double [] { entry.getKey(), entry.getValue() }); |
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76 } |
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77 |
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78 return list; |
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79 } |
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80 |
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81 public static void main(String [] args) { |
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82 |
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83 Function function = FunctionFactory |
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84 .getInstance() |
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85 .getFunction(FUNCTION_NAME); |
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86 |
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87 if (function == null) { |
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88 System.err.println("Cannot find function '" + FUNCTION_NAME + "'."); |
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89 System.exit(1); |
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90 } |
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91 |
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92 List<Double []> points = null; |
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93 |
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94 try { |
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95 points = readPoints(new InputStreamReader(System.in)); |
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96 } |
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97 catch (IOException ioe) { |
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98 ioe.printStackTrace(); |
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99 System.exit(1); |
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100 } |
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101 |
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102 LevenbergMarquardtOptimizer lmo = new LevenbergMarquardtOptimizer(); |
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103 |
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104 CurveFitter cf = new CurveFitter(lmo); |
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105 |
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106 for (Double [] point: points) { |
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107 cf.addObservedPoint(point[0], point[1]); |
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108 } |
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109 |
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110 double [] parameters = null; |
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111 |
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112 try { |
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113 parameters = cf.fit(function, function.getInitialGuess()); |
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114 } |
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115 catch (MathException me) { |
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116 me.printStackTrace(); |
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117 System.exit(1); |
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118 } |
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119 |
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120 String [] parameterNames = function.getParameterNames(); |
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121 |
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122 for (int i = 0; i < parameterNames.length; ++i) { |
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123 System.err.println(parameterNames[i] + ": " + parameters[i]); |
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124 } |
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125 } |
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126 } |
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127 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |