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package de.lmu.ifi.dbs.elki.algorithm.clustering.hierarchical;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import de.lmu.ifi.dbs.elki.utilities.Alias;
import de.lmu.ifi.dbs.elki.utilities.documentation.Reference;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
/**
* Weighted average linkage clustering method.
*
* This is somewhat a misnomer, as it actually ignores that the clusters should
* likely be weighted differently according to their size when computing the
* average linkage. See {@link GroupAverageLinkageMethod} for the UPGMA method
* that uses the group size to weight the objects the same way.
*
* Reference:
* <p>
* A. K. Jain and R. C. Dubes<br />
* Algorithms for Clustering Data<br />
* Prentice-Hall
* </p>
*
* @author Erich Schubert
* @since 0.6.0
*/
@Reference(authors = "A. K. Jain and R. C. Dubes", //
title = "Algorithms for Clustering Data", //
booktitle = "Algorithms for Clustering Data, Prentice-Hall")
@Alias({ "wpgma", "WPGMA" })
public class WeightedAverageLinkageMethod implements LinkageMethod {
/**
* Static instance of class.
*/
public static final WeightedAverageLinkageMethod STATIC = new WeightedAverageLinkageMethod();
/**
* Constructor.
*
* @deprecated use the static instance {@link #STATIC} instead.
*/
@Deprecated
public WeightedAverageLinkageMethod() {
super();
}
@Override
public double combine(int sizex, double dx, int sizey, double dy, int sizej, double dxy) {
return .5 * (dx + dy);
}
/**
* Class parameterizer.
*
* Returns the static instance.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends AbstractParameterizer {
@Override
protected WeightedAverageLinkageMethod makeInstance() {
return STATIC;
}
}
}
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