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    
030    public class IndexOfMin extends AbstractDoubleCalculation {
031            private static final long serialVersionUID = -8301078828905448159L;
032    
033            public IndexOfMin(int dimension, Matrix matrix) {
034                    super(dimension, matrix);
035            }
036    
037            
038            public double getDouble(long... coordinates) throws MatrixException {
039                    double min = Double.MAX_VALUE;
040                    long index = -1;
041                    switch (getDimension()) {
042                    case ROW:
043                            for (long r = getSource().getSize()[ROW] - 1; r != -1; r--) {
044                                    double v = getSource().getAsDouble(r, coordinates[COLUMN]);
045                                    if (v < min) {
046                                            min = v;
047                                            index = r;
048                                    }
049                            }
050                            return index;
051                    case COLUMN:
052                            for (long c = getSource().getSize()[COLUMN] - 1; c != -1; c--) {
053                                    double v = getSource().getAsDouble(coordinates[ROW], c);
054                                    if (v < min) {
055                                            min = v;
056                                            index = c;
057                                    }
058                            }
059                            return index;
060                    }
061                    return 0.0;
062            }
063    
064            
065            public long[] getSize() {
066                    switch (getDimension()) {
067                    case ROW:
068                            return new long[] { 1, getSource().getSize()[COLUMN] };
069                    case COLUMN:
070                            return new long[] { getSource().getSize()[ROW], 1 };
071                    }
072                    return null;
073            }
074    
075    }