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.LU; 027 import org.ojalgo.matrix.decomposition.LUDecomposition; 028 import org.ojalgo.matrix.decomposition.QR; 029 import org.ojalgo.matrix.decomposition.QRDecomposition; 030 import org.ojalgo.matrix.store.PrimitiveDenseStore; 031 import org.ujmp.core.Matrix; 032 import org.ujmp.ojalgo.OjalgoDenseDoubleMatrix2D; 033 034 public class Solve 035 implements 036 org.ujmp.core.doublematrix.calculation.general.decomposition.Solve<Matrix> { 037 038 public static Solve INSTANCE = new Solve(); 039 040 public Matrix calc(Matrix a, Matrix b) { 041 PrimitiveDenseStore a2 = null; 042 PrimitiveDenseStore b2 = null; 043 if (a instanceof OjalgoDenseDoubleMatrix2D) { 044 a2 = ((OjalgoDenseDoubleMatrix2D) a).getWrappedObject(); 045 } else { 046 a2 = new OjalgoDenseDoubleMatrix2D(a).getWrappedObject(); 047 } 048 if (b instanceof OjalgoDenseDoubleMatrix2D) { 049 b2 = ((OjalgoDenseDoubleMatrix2D) b).getWrappedObject(); 050 } else { 051 b2 = new OjalgoDenseDoubleMatrix2D(b).getWrappedObject(); 052 } 053 if (a.isSquare()) { 054 final LU<Double> lu = LUDecomposition.makePrimitive(); 055 lu.compute(a2); 056 return new OjalgoDenseDoubleMatrix2D(lu.solve(b2)); 057 } else { 058 final QR<Double> qr = QRDecomposition.makePrimitive(); 059 qr.compute(a2); 060 return new OjalgoDenseDoubleMatrix2D(qr.solve(b2)); 061 } 062 } 063 064 }