package de.lmu.ifi.dbs.elki.math.linearalgebra.pca;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
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 java.util.Collection;
import java.util.Iterator;
import de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.database.ids.DBIDUtil;
import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
import de.lmu.ifi.dbs.elki.database.ids.ModifiableDBIDs;
import de.lmu.ifi.dbs.elki.database.query.DistanceResultPair;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.distance.distancevalue.NumberDistance;
import de.lmu.ifi.dbs.elki.math.linearalgebra.Matrix;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.Parameterizable;
/**
* Abstract class with the task of computing a Covariance matrix to be used in PCA.
* Mostly the specification of an interface.
*
* @author Erich Schubert
*
* @param <V> Vector class in use
*/
public abstract class AbstractCovarianceMatrixBuilder<V extends NumberVector<? extends V, ?>> implements Parameterizable, CovarianceMatrixBuilder<V> {
@Override
public Matrix processDatabase(Relation<? extends V> database) {
return processIds(database.getDBIDs(), database);
}
@Override
public abstract Matrix processIds(DBIDs ids, Relation<? extends V> database);
@Override
public <D extends NumberDistance<?, ?>> Matrix processQueryResults(Collection<DistanceResultPair<D>> results, Relation<? extends V> database, int k) {
ModifiableDBIDs ids = DBIDUtil.newArray(k);
int have = 0;
for(Iterator<DistanceResultPair<D>> it = results.iterator(); it.hasNext() && have < k; have++) {
ids.add(it.next().getDBID());
}
return processIds(ids, database);
}
@Override
final public <D extends NumberDistance<?, ?>> Matrix processQueryResults(Collection<DistanceResultPair<D>> results, Relation<? extends V> database) {
return processQueryResults(results, database, results.size());
}
// TODO: Allow KNNlist to avoid building the DBID array?
}