Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/sq/Fitting.java @ 3566:8d0f06b76e09

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S/Q relation: Fixed flys/issue748 flys-artifacts/trunk@5164 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 01 Aug 2012 10:19:45 +0000
parents 1df6984628c3
children b8b1280606c2
rev   line source
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1 package de.intevation.flys.artifacts.model.sq;
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2
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3 import de.intevation.flys.artifacts.math.fitting.Function;
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4
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5 import java.util.ArrayList;
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6 import java.util.Iterator;
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7 import java.util.List;
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8
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9 import org.apache.commons.math.MathException;
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10
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11 import org.apache.commons.math.optimization.fitting.CurveFitter;
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12
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13 import org.apache.commons.math.optimization.general.LevenbergMarquardtOptimizer;
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14
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15 import org.apache.log4j.Logger;
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16
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17 public class Fitting
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18 implements Outlier.Callback
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19 {
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20 private static Logger log = Logger.getLogger(Fitting.class);
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21
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22 public interface Callback {
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23
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24 void afterIteration(
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25 double [] parameters,
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26 SQ [] measurements,
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27 SQ [] outliers,
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28 double standardDeviation,
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29 double chiSqr);
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30 } // interfacte
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31
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32 protected Function function;
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33
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34 protected double [] coeffs;
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35
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36 protected de.intevation.flys.artifacts.math.Function instance;
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37
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38 protected double stdDevFactor;
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39 protected double chiSqr;
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40
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41 protected Callback callback;
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42
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43 public Fitting() {
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44 }
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45
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46 public Fitting(Function function, double stdDevFactor) {
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47 this();
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48 this.function = function;
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49 this.stdDevFactor = stdDevFactor;
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50 }
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51
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52 public Function getFunction() {
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53 return function;
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54 }
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55
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56 public void setFunction(Function function) {
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57 this.function = function;
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58 }
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59
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60 public double getStdDevFactor() {
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61 return stdDevFactor;
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62 }
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63
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64 public void setStdDevFactor(double stdDevFactor) {
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65 this.stdDevFactor = stdDevFactor;
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66 }
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67
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68 @Override
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69 public void initialize(List<SQ> sqs) throws MathException {
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70
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71 LevenbergMarquardtOptimizer lmo =
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72 new LevenbergMarquardtOptimizer();
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73
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74 CurveFitter cf = new CurveFitter(lmo);
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75 for (SQ sq: sqs) {
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76 cf.addObservedPoint(sq.getQ(), sq.getS());
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77 }
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78
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79 coeffs = cf.fit(
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80 function, function.getInitialGuess());
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81
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82 instance = function.instantiate(coeffs);
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83
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84 chiSqr = lmo.getChiSquare();
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85 }
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86
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87 @Override
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88 public double eval(SQ sq) {
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89 double s = instance.value(sq.q);
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90 return sq.s - s;
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91 }
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92
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93 @Override
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94 public void iterationFinished(
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95 double standardDeviation,
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96 SQ outlier,
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97 List<SQ> remainings
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98 ) {
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99 if (log.isDebugEnabled()) {
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100 log.debug("iterationFinished ----");
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101 log.debug(" num remainings: " + remainings.size());
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102 log.debug(" has outlier: " + outlier != null);
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103 log.debug(" standardDeviation: " + standardDeviation);
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104 log.debug(" Chi^2: " + chiSqr);
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105 log.debug("---- iterationFinished");
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106 }
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107 callback.afterIteration(
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108 coeffs,
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109 remainings.toArray(new SQ[remainings.size()]),
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110 outlier != null ? new SQ [] { outlier} : new SQ [] {},
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111 standardDeviation,
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112 chiSqr);
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113 }
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114
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115 protected static final List<SQ> onlyValid(List<SQ> sqs) {
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116
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117 List<SQ> good = new ArrayList<SQ>(sqs.size());
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118
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119 for (SQ sq: sqs) {
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120 if (sq.isValid()) {
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121 good.add(sq);
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122 }
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123 }
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124
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125 return good;
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126 }
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127
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128 public boolean fit(List<SQ> sqs, Callback callback) {
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129
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130 sqs = onlyValid(sqs);
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131
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132 if (sqs.size() < 2) {
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133 log.warn("Too less points for fitting.");
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134 return false;
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135 }
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136
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137 this.callback = callback;
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138
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139 try {
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140 Outlier.detectOutliers(this, sqs, stdDevFactor);
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141 }
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142 catch (MathException me) {
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143 log.warn(me);
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144 return false;
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145 }
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146
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147 return true;
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148 }
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149 }
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150 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org