Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/sq/Fitting.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children af13ceeba52a
rev   line source
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.artifacts.model.sq;
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10
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11 import org.dive4elements.river.artifacts.math.fitting.Function;
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12
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13 import java.util.ArrayList;
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14 import java.util.List;
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15
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16 import org.apache.commons.math.MathException;
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17
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18 import org.apache.commons.math.optimization.fitting.CurveFitter;
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19
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20 import org.apache.commons.math.optimization.general.LevenbergMarquardtOptimizer;
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21
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22 import org.apache.log4j.Logger;
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23
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24 public class Fitting
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25 implements Outlier.Callback
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26 {
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27 private static Logger log = Logger.getLogger(Fitting.class);
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28
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29 public interface Callback {
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30
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31 void afterIteration(
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32 double [] parameters,
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33 SQ [] measurements,
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34 SQ [] outliers,
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35 double standardDeviation,
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36 double chiSqr);
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37 } // interfacte
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38
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39 protected Function function;
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40
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41 protected double [] coeffs;
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42
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43 protected org.dive4elements.river.artifacts.math.Function instance;
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44
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45 protected double stdDevFactor;
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46 protected double chiSqr;
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47
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48 protected Callback callback;
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49
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50 public Fitting() {
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51 }
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52
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53 public Fitting(Function function, double stdDevFactor) {
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54 this();
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55 this.function = function;
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56 this.stdDevFactor = stdDevFactor;
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57 }
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58
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59 public Function getFunction() {
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60 return function;
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61 }
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62
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63 public void setFunction(Function function) {
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64 this.function = function;
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65 }
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66
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67 public double getStdDevFactor() {
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68 return stdDevFactor;
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69 }
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70
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71 public void setStdDevFactor(double stdDevFactor) {
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72 this.stdDevFactor = stdDevFactor;
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73 }
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74
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75 @Override
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76 public void initialize(List<SQ> sqs) throws MathException {
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77
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78 LevenbergMarquardtOptimizer lmo =
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79 new LevenbergMarquardtOptimizer();
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80
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81 CurveFitter cf = new CurveFitter(lmo);
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82 for (SQ sq: sqs) {
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83 cf.addObservedPoint(sq.getQ(), sq.getS());
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84 }
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85
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86 coeffs = cf.fit(
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87 function, function.getInitialGuess());
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88
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89 instance = function.instantiate(coeffs);
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90
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91 chiSqr = lmo.getChiSquare();
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92 }
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93
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94 @Override
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95 public double eval(SQ sq) {
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96 double s = instance.value(sq.q);
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97 return sq.s - s;
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98 }
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99
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100 @Override
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101 public void iterationFinished(
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102 double standardDeviation,
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103 SQ outlier,
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104 List<SQ> remainings
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105 ) {
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106 if (log.isDebugEnabled()) {
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107 log.debug("iterationFinished ----");
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108 log.debug(" num remainings: " + remainings.size());
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109 log.debug(" has outlier: " + outlier != null);
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110 log.debug(" standardDeviation: " + standardDeviation);
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111 log.debug(" Chi^2: " + chiSqr);
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112 log.debug("---- iterationFinished");
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113 }
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114 callback.afterIteration(
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115 coeffs,
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116 remainings.toArray(new SQ[remainings.size()]),
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117 outlier != null ? new SQ [] { outlier} : new SQ [] {},
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118 standardDeviation,
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119 chiSqr);
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120 }
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121
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122 protected static final List<SQ> onlyValid(List<SQ> sqs) {
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123
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124 List<SQ> good = new ArrayList<SQ>(sqs.size());
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125
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126 for (SQ sq: sqs) {
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127 if (sq.isValid()) {
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128 good.add(sq);
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129 }
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130 }
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131
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132 return good;
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133 }
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134
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135 public boolean fit(List<SQ> sqs, String method, Callback callback) {
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136
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137 sqs = onlyValid(sqs);
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138
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139 if (sqs.size() < 2) {
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140 log.warn("Too less points for fitting.");
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141 return false;
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142 }
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143
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144 this.callback = callback;
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145
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146 try {
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147 Outlier.detectOutliers(this, sqs, stdDevFactor, method);
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148 }
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149 catch (MathException me) {
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150 log.warn(me);
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151 return false;
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152 }
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153
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154 return true;
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155 }
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156 }
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157 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org