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.general.statistical;
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 Cumsum extends AbstractDoubleCalculation {
032            private static final long serialVersionUID = 5652893080805473737L;
033    
034            private Matrix cumsum = null;
035    
036            private boolean ignoreNaN = true;
037    
038            public Cumsum(Matrix m, boolean ignoreNaN) {
039                    super(m);
040                    this.ignoreNaN = ignoreNaN;
041            }
042    
043            public double getDouble(long... coordinates) throws MatrixException {
044                    if (cumsum == null) {
045                            createMatrix();
046                    }
047                    return cumsum.getAsDouble(coordinates);
048            }
049    
050            private void createMatrix() {
051                    Matrix source = getSource();
052                    Matrix m = Matrix.factory.zeros(source.getSize());
053                    for (long c = 0; c < source.getColumnCount(); c++) {
054                            double sum = 0;
055                            for (long r = 0; r < source.getRowCount(); r++) {
056                                    sum += ignoreNaN ? MathUtil.ignoreNaN(source.getAsDouble(r, c)) : source
057                                                    .getAsDouble(r, c);
058                                    m.setAsDouble(sum, r, c);
059                            }
060                    }
061                    cumsum = m;
062            }
063    }