Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/sq/Fitting.java @ 4181:e1f81795401f
Let MAINVALUES enter life in inactive state in WINFOArtifact.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Thu, 18 Oct 2012 20:14:48 +0200 |
parents | b8b1280606c2 |
children | aaf810d4ec82 |
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package de.intevation.flys.artifacts.model.sq; import de.intevation.flys.artifacts.math.fitting.Function; import java.util.ArrayList; import java.util.List; import org.apache.commons.math.MathException; import org.apache.commons.math.optimization.fitting.CurveFitter; import org.apache.commons.math.optimization.general.LevenbergMarquardtOptimizer; import org.apache.log4j.Logger; public class Fitting implements Outlier.Callback { private static Logger log = Logger.getLogger(Fitting.class); public interface Callback { void afterIteration( double [] parameters, SQ [] measurements, SQ [] outliers, double standardDeviation, double chiSqr); } // interfacte protected Function function; protected double [] coeffs; protected de.intevation.flys.artifacts.math.Function instance; protected double stdDevFactor; protected double chiSqr; protected Callback callback; public Fitting() { } public Fitting(Function function, double stdDevFactor) { this(); this.function = function; this.stdDevFactor = stdDevFactor; } public Function getFunction() { return function; } public void setFunction(Function function) { this.function = function; } public double getStdDevFactor() { return stdDevFactor; } public void setStdDevFactor(double stdDevFactor) { this.stdDevFactor = stdDevFactor; } @Override public void initialize(List<SQ> sqs) throws MathException { LevenbergMarquardtOptimizer lmo = new LevenbergMarquardtOptimizer(); CurveFitter cf = new CurveFitter(lmo); for (SQ sq: sqs) { cf.addObservedPoint(sq.getQ(), sq.getS()); } coeffs = cf.fit( function, function.getInitialGuess()); instance = function.instantiate(coeffs); chiSqr = lmo.getChiSquare(); } @Override public double eval(SQ sq) { double s = instance.value(sq.q); return sq.s - s; } @Override public void iterationFinished( double standardDeviation, SQ outlier, List<SQ> remainings ) { if (log.isDebugEnabled()) { log.debug("iterationFinished ----"); log.debug(" num remainings: " + remainings.size()); log.debug(" has outlier: " + outlier != null); log.debug(" standardDeviation: " + standardDeviation); log.debug(" Chi^2: " + chiSqr); log.debug("---- iterationFinished"); } callback.afterIteration( coeffs, remainings.toArray(new SQ[remainings.size()]), outlier != null ? new SQ [] { outlier} : new SQ [] {}, standardDeviation, chiSqr); } protected static final List<SQ> onlyValid(List<SQ> sqs) { List<SQ> good = new ArrayList<SQ>(sqs.size()); for (SQ sq: sqs) { if (sq.isValid()) { good.add(sq); } } return good; } public boolean fit(List<SQ> sqs, Callback callback) { sqs = onlyValid(sqs); if (sqs.size() < 2) { log.warn("Too less points for fitting."); return false; } this.callback = callback; try { Outlier.detectOutliers(this, sqs, stdDevFactor); } catch (MathException me) { log.warn(me); return false; } return true; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :