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 org.ujmp.core.Matrix;
027    import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation;
028    import org.ujmp.core.doublematrix.calculation.general.statistical.Std;
029    import org.ujmp.core.exceptions.MatrixException;
030    
031    public class Standardize extends AbstractDoubleCalculation {
032            private static final long serialVersionUID = 6454174968175712888L;
033    
034            private Matrix center = null;
035    
036            private Matrix sigma = null;
037    
038            public Standardize(int dimension, Matrix matrix) {
039                    super(dimension, matrix);
040            }
041    
042            public double getDouble(long... coordinates) throws MatrixException {
043                    if (center == null) {
044                            center = new Center(true, getDimension(), getSource()).calcNew();
045                    }
046                    if (sigma == null) {
047                            sigma = new Std(getDimension(), true, center).calcNew();
048                    }
049                    switch (getDimension()) {
050                    case ALL:
051                            return center.getAsDouble(coordinates) / sigma.getAsDouble(0, 0);
052                    case ROW:
053                            return center.getAsDouble(coordinates) / sigma.getAsDouble(0, coordinates[COLUMN]);
054                    case COLUMN:
055                            return center.getAsDouble(coordinates) / sigma.getAsDouble(coordinates[ROW], 0);
056                    }
057                    return Double.NaN;
058            }
059    
060    }