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.QRDecomposition; 027 import org.ojalgo.matrix.store.PrimitiveDenseStore; 028 import org.ujmp.core.Matrix; 029 import org.ujmp.ojalgo.OjalgoDenseDoubleMatrix2D; 030 031 public class QR implements 032 org.ujmp.core.doublematrix.calculation.general.decomposition.QR<Matrix> { 033 034 public static QR INSTANCE = new QR(); 035 036 public Matrix[] calc(Matrix source) { 037 final org.ojalgo.matrix.decomposition.QR<Double> qr = QRDecomposition 038 .makePrimitive(); 039 PrimitiveDenseStore matrix = null; 040 if (source instanceof OjalgoDenseDoubleMatrix2D) { 041 matrix = ((OjalgoDenseDoubleMatrix2D) source).getWrappedObject(); 042 } else { 043 matrix = new OjalgoDenseDoubleMatrix2D(source).getWrappedObject(); 044 } 045 qr.compute(matrix); 046 final Matrix q = new OjalgoDenseDoubleMatrix2D(qr.getQ()); 047 final Matrix r = new OjalgoDenseDoubleMatrix2D(qr.getR()); 048 return new Matrix[] { q, r }; 049 } 050 051 public Matrix solve(Matrix a, Matrix b) { 052 final org.ojalgo.matrix.decomposition.QR<Double> qr = QRDecomposition 053 .makePrimitive(); 054 PrimitiveDenseStore a2 = null; 055 PrimitiveDenseStore b2 = null; 056 if (a instanceof OjalgoDenseDoubleMatrix2D) { 057 a2 = ((OjalgoDenseDoubleMatrix2D) a).getWrappedObject(); 058 } else { 059 a2 = new OjalgoDenseDoubleMatrix2D(a).getWrappedObject(); 060 } 061 if (b instanceof OjalgoDenseDoubleMatrix2D) { 062 b2 = ((OjalgoDenseDoubleMatrix2D) b).getWrappedObject(); 063 } else { 064 b2 = new OjalgoDenseDoubleMatrix2D(b).getWrappedObject(); 065 } 066 qr.compute(a2); 067 return new OjalgoDenseDoubleMatrix2D(qr.solve(b2)); 068 } 069 070 }