Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/sq/Outlier.java @ 4187:21f4e4b79121
Refactor GaugeDischargeCurveFacet to be able to set a facet name
For adding another output of the GaugeDischargeCurveArtifact it is necessary to
provide to facet instances with different names. Therefore the
GaugeDischargeCurveFacet is extended to set the facet name in the constructor.
author | Björn Ricks <bjoern.ricks@intevation.de> |
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date | Fri, 19 Oct 2012 13:25:49 +0200 |
parents | b8b1280606c2 |
children | a7d080347ac3 |
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package de.intevation.flys.artifacts.model.sq; import java.util.ArrayList; import java.util.List; import org.apache.commons.math.MathException; import org.apache.commons.math.stat.descriptive.moment.StandardDeviation; import org.apache.log4j.Logger; public class Outlier { private static Logger log = Logger.getLogger(Outlier.class); public interface Callback { void initialize(List<SQ> sqs) throws MathException; double eval(SQ sq); void iterationFinished( double stdDev, SQ outlier, List<SQ> remaining); } // interface Callback public static void detectOutliers( Callback callback, List<SQ> sqs, double stdDevFactor ) throws MathException { boolean debug = log.isDebugEnabled(); if (debug) { log.debug("stdDevFactor: " + stdDevFactor); } List<SQ> data = new ArrayList<SQ>(sqs); while (data.size() > 2) { callback.initialize(data); StandardDeviation stdDev = new StandardDeviation(); double maxValue = -Double.MAX_VALUE; int maxIndex = -1; for (int i = data.size()-1; i >= 0; --i) { double value = Math.abs(callback.eval(data.get(i))); stdDev.increment(value); if (value > maxValue) { maxValue = value; maxIndex = i; } } double sd = stdDev.getResult(); double accepted = stdDevFactor * sd; if (debug) { log.debug("std dev: " + stdDev); log.debug("accepted: " + accepted); log.debug("max value: " + maxValue); } SQ outlier = maxValue > accepted ? data.remove(maxIndex) : null; callback.iterationFinished(sd, outlier, data); if (outlier == null) { break; } } } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :