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.jblas.calculation;
025    
026    import org.jblas.DoubleMatrix;
027    import org.ujmp.core.Matrix;
028    import org.ujmp.core.interfaces.HasColumnMajorDoubleArray1D;
029    import org.ujmp.jblas.JBlasDenseDoubleMatrix2D;
030    
031    public class SolveSPD
032                    implements
033                    org.ujmp.core.doublematrix.calculation.general.decomposition.SolveSPD<Matrix> {
034    
035            public static SolveSPD INSTANCE = new SolveSPD();
036    
037            public Matrix calc(Matrix a, Matrix b) {
038                    final DoubleMatrix a2;
039                    final DoubleMatrix b2;
040                    if (a instanceof JBlasDenseDoubleMatrix2D) {
041                            a2 = ((JBlasDenseDoubleMatrix2D) a).getWrappedObject();
042                    } else if (a instanceof HasColumnMajorDoubleArray1D) {
043                            a2 = new JBlasDenseDoubleMatrix2D(a.getRowCount(), a
044                                            .getColumnCount(), ((HasColumnMajorDoubleArray1D) a)
045                                            .getColumnMajorDoubleArray1D()).getWrappedObject();
046                    } else {
047                            a2 = new JBlasDenseDoubleMatrix2D(a).getWrappedObject();
048                    }
049                    if (b instanceof JBlasDenseDoubleMatrix2D) {
050                            b2 = ((JBlasDenseDoubleMatrix2D) b).getWrappedObject();
051                    } else if (b instanceof HasColumnMajorDoubleArray1D) {
052                            b2 = new JBlasDenseDoubleMatrix2D(b.getRowCount(), b
053                                            .getColumnCount(), ((HasColumnMajorDoubleArray1D) b)
054                                            .getColumnMajorDoubleArray1D()).getWrappedObject();
055                    } else {
056                            b2 = new JBlasDenseDoubleMatrix2D(b).getWrappedObject();
057                    }
058                    try {
059                            final DoubleMatrix x = org.jblas.Solve.solvePositive(a2, b2);
060                            return new JBlasDenseDoubleMatrix2D(x);
061                    } catch (final Throwable t) {
062                            return org.ujmp.core.doublematrix.calculation.general.decomposition.Solve.UJMPSQUARE
063                                            .calc(a, b);
064                    }
065            }
066    
067    }