/*
* Copyright (C) 2008-2015 by Holger Arndt
*
* This file is part of the Universal Java Matrix Package (UJMP).
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership and licensing.
*
* UJMP is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* UJMP 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with UJMP; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
package org.ujmp.core.doublematrix.calculation.general.decomposition;
import org.ujmp.core.Matrix;
import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation;
public class Princomp extends AbstractDoubleCalculation {
private static final long serialVersionUID = -6137993493011004670L;
private Matrix pca = null;
public Princomp(Matrix matrix) {
super(matrix);
}
public double getDouble(long... coordinates) {
if (pca == null) {
Matrix[] usv;
usv = getSource().svd();
Matrix u = usv[0];
Matrix s = usv[1];
pca = u.mtimes(s);
}
return pca.getAsDouble(coordinates);
}
}