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 Diff extends AbstractDoubleCalculation {
032            private static final long serialVersionUID = 7565251430714359410L;
033    
034            private boolean ignoreNaN = true;
035    
036            public Diff(int dimension, boolean ignoreNaN, Matrix source) {
037                    super(dimension, source);
038                    this.ignoreNaN = ignoreNaN;
039            }
040    
041            
042            public double getDouble(long... coordinates) throws MatrixException {
043                    double v1 = 0.0;
044                    double v2 = 0.0;
045                    switch (getDimension()) {
046                    case ROW:
047                            v1 = getSource().getAsDouble(coordinates[ROW], coordinates[COLUMN]);
048                            v2 = getSource().getAsDouble(coordinates[ROW] + 1, coordinates[COLUMN]);
049                            break;
050                    case COLUMN:
051                            v1 = getSource().getAsDouble(coordinates[ROW], coordinates[COLUMN]);
052                            v2 = getSource().getAsDouble(coordinates[ROW], coordinates[COLUMN] + 1);
053                            break;
054                    default:
055                            throw new MatrixException("not possible for this dimension");
056                    }
057                    if (ignoreNaN && (MathUtil.isNaNOrInfinite(v1) || MathUtil.isNaNOrInfinite(v2))) {
058                            return 0.0;
059                    } else {
060                            return v2 - v1;
061                    }
062            }
063    
064            public long[] getSize() {
065                    switch (getDimension()) {
066                    case ROW:
067                            return new long[] { getSource().getRowCount() - 1, getSource().getColumnCount() };
068                    case COLUMN:
069                            return new long[] { getSource().getRowCount(), getSource().getColumnCount() - 1 };
070                    default:
071                            throw new MatrixException("not possible for this dimension");
072                    }
073            }
074    
075    }