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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) 2012
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 de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
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;
/**
* Interface for computing covariance matrixes on a data set.
*
* @author Erich Schubert
*
* @param <V> Vector base type
*/
public interface CovarianceMatrixBuilder<V extends NumberVector<? extends V, ?>> {
/**
* Compute Covariance Matrix for a complete database
*
* @param database the database used
* @return Covariance Matrix
*/
public Matrix processDatabase(Relation<? extends V> database);
/**
* Compute Covariance Matrix for a collection of database IDs
*
* @param ids a collection of ids
* @param database the database used
* @return Covariance Matrix
*/
public Matrix processIds(DBIDs ids, Relation<? extends V> database);
/**
* Compute Covariance Matrix for a QueryResult Collection
*
* By default it will just collect the ids and run processIds
*
* @param results a collection of QueryResults
* @param database the database used
* @param k the number of entries to process
* @return Covariance Matrix
*/
public <D extends NumberDistance<?, ?>> Matrix processQueryResults(Collection<? extends DistanceResultPair<D>> results, Relation<? extends V> database, int k);
/**
* Compute Covariance Matrix for a QueryResult Collection
*
* By default it will just collect the ids and run processIds
*
* @param results a collection of QueryResults
* @param database the database used
* @return Covariance Matrix
*/
public <D extends NumberDistance<?, ?>> Matrix processQueryResults(Collection<? extends DistanceResultPair<D>> results, Relation<? extends V> database);
}
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