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.core.doublematrix.calculation.basic;
025    
026    import org.ujmp.core.Matrix;
027    import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation;
028    import org.ujmp.core.exceptions.MatrixException;
029    import org.ujmp.core.util.MathUtil;
030    
031    public class Mtimes extends AbstractDoubleCalculation {
032            private static final long serialVersionUID = 4170937261358240120L;
033    
034            private boolean ignoreNaN = false;
035    
036            private long[] size = null;
037    
038            public Mtimes(boolean ignoreNaN, Matrix m1, Matrix m2) {
039                    super(m1, m2);
040                    this.ignoreNaN = ignoreNaN;
041                    this.size = new long[] { m1.getRowCount(), m2.getColumnCount() };
042            }
043    
044            public Mtimes() {
045                    super();
046            }
047    
048            public double getDouble(long... coordinates) throws MatrixException {
049                    final Matrix m1 = getSources()[0];
050                    final Matrix m2 = getSources()[1];
051    
052                    final long row = coordinates[ROW];
053                    final long col = coordinates[COLUMN];
054    
055                    double sum = 0.0;
056                    if (ignoreNaN) {
057                            for (long k = m1.getColumnCount(); --k >= 0;) {
058                                    sum += MathUtil.ignoreNaN(m1.getAsDouble(row, k))
059                                                    * MathUtil.ignoreNaN(m2.getAsDouble(k, col));
060                            }
061                    } else {
062                            for (long k = m1.getColumnCount(); --k >= 0;) {
063                                    sum += m1.getAsDouble(row, k) * m2.getAsDouble(k, col);
064                            }
065                    }
066    
067                    return sum;
068            }
069    
070            public long[] getSize() {
071                    return size;
072            }
073    
074    }