001    /*
002     * Copyright (C) 2008-2010 by Holger Arndt
003     *
004     * This file is part of the Universal Java Matrix Package (UJMP).
005     * See the NOTICE file distributed with this work for additional
006     * information regarding copyright ownership and licensing.
007     *
008     * UJMP is free software; you can redistribute it and/or modify
009     * it under the terms of the GNU Lesser General Public License as
010     * published by the Free Software Foundation; either version 2
011     * of the License, or (at your option) any later version.
012     *
013     * UJMP is distributed in the hope that it will be useful,
014     * but WITHOUT ANY WARRANTY; without even the implied warranty of
015     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
016     * GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public
019     * License along with UJMP; if not, write to the
020     * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
021     * Boston, MA  02110-1301  USA
022     */
023    
024    package org.ujmp.ojalgo.calculation;
025    
026    import org.ojalgo.matrix.decomposition.Eigenvalue;
027    import org.ojalgo.matrix.decomposition.EigenvalueDecomposition;
028    import org.ojalgo.matrix.store.PrimitiveDenseStore;
029    import org.ujmp.core.Matrix;
030    import org.ujmp.ojalgo.OjalgoDenseDoubleMatrix2D;
031    
032    public class Eig
033                    implements
034                    org.ujmp.core.doublematrix.calculation.general.decomposition.Eig<Matrix> {
035    
036            public static Eig INSTANCE = new Eig();
037    
038            public Matrix[] calc(Matrix source) {
039                    final Eigenvalue<Double> evd = EigenvalueDecomposition.makePrimitive();
040                    PrimitiveDenseStore matrix = null;
041                    if (source instanceof OjalgoDenseDoubleMatrix2D) {
042                            matrix = ((OjalgoDenseDoubleMatrix2D) source).getWrappedObject();
043                    } else {
044                            matrix = new OjalgoDenseDoubleMatrix2D(source).getWrappedObject();
045                    }
046                    evd.compute(matrix);
047                    final Matrix v = new OjalgoDenseDoubleMatrix2D(evd.getV());
048                    final Matrix d = new OjalgoDenseDoubleMatrix2D(evd.getD());
049                    return new Matrix[] { v, d };
050            }
051    }