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.misc;
025    
026    import java.util.ArrayList;
027    import java.util.HashSet;
028    import java.util.List;
029    import java.util.Set;
030    
031    import org.ujmp.core.Matrix;
032    import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation;
033    import org.ujmp.core.exceptions.MatrixException;
034    import org.ujmp.core.util.MathUtil;
035    
036    public class DiscretizeToColumns extends AbstractDoubleCalculation {
037            private static final long serialVersionUID = -3606534079672701424L;
038    
039            private long column = 0;
040    
041            private List<Object> values = null;
042    
043            private boolean ignoreNaN = false;
044    
045            public DiscretizeToColumns(Matrix matrix, boolean ignoreNaN, long column) {
046                    super(matrix);
047                    this.column = column;
048                    this.ignoreNaN = ignoreNaN;
049            }
050    
051            
052            public long[] getSize() {
053                    try {
054                            countValues();
055                    } catch (MatrixException e) {
056                            // TODO Auto-generated catch block
057                            e.printStackTrace();
058                    }
059                    long[] size = getSource().getSize();
060                    size[COLUMN] += values.size() - 1;
061                    return size;
062            }
063    
064            
065            public double getDouble(long... coordinates) throws MatrixException {
066                    countValues();
067                    if (coordinates[COLUMN] < column) {
068                            return getSource().getAsDouble(coordinates);
069                    } else if (coordinates[COLUMN] >= column + values.size()) {
070                            long col = coordinates[COLUMN] - values.size() + 1;
071                            return getSource().getAsDouble(coordinates[ROW], col);
072                    } else {
073                            Object o = getSource().getAsObject(coordinates[ROW], column);
074                            if (ignoreNaN) {
075                                    if (MathUtil.isNaNOrInfinite(o)) {
076                                            return 0.0;
077                                    } else {
078                                            int index = values.indexOf(o);
079                                            long col = coordinates[COLUMN] - column;
080                                            if (index == col) {
081                                                    return 1.0;
082                                            } else {
083                                                    return 0.0;
084                                            }
085                                    }
086                            } else {
087                                    if (MathUtil.isNaNOrInfinite(o)) {
088                                            return Double.NaN;
089                                    } else {
090                                            int index = values.indexOf(o);
091                                            long col = coordinates[COLUMN] - column;
092                                            if (index == col) {
093                                                    return 1.0;
094                                            } else {
095                                                    return 0.0;
096                                            }
097                                    }
098                            }
099    
100                    }
101            }
102    
103            private void countValues() throws MatrixException {
104                    if (values == null) {
105                            Set<Object> set = new HashSet<Object>();
106                            for (long row = getSource().getRowCount(); --row >= 0;) {
107                                    Object o = getSource().getAsObject(row, column);
108                                    if (ignoreNaN) {
109                                            if (MathUtil.isNaNOrInfinite(o)) {
110                                                    set.add(Double.valueOf(0.0));
111                                            } else {
112                                                    set.add(o);
113                                            }
114                                    } else {
115                                            if (!MathUtil.isNaNOrInfinite(o)) {
116                                                    set.add(o);
117                                            }
118                                    }
119    
120                            }
121                            values = new ArrayList<Object>(set);
122                    }
123            }
124    
125    }