/*
 * Copyright (C) 2008-2015 by Holger Arndt
 *
 * This file is part of the Universal Java Matrix Package (UJMP).
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership and licensing.
 *
 * UJMP is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * UJMP is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with UJMP; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301  USA
 */

package org.ujmp.core.doublematrix.calculation.general.misc;

import org.ujmp.core.Matrix;
import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation;
import org.ujmp.core.doublematrix.calculation.general.statistical.Std;

public class Standardize extends AbstractDoubleCalculation {
	private static final long serialVersionUID = 6454174968175712888L;

	private Matrix center = null;

	private Matrix sigma = null;

	public Standardize(int dimension, Matrix matrix) {
		super(dimension, matrix);
	}

	public double getDouble(long... coordinates) {
		if (center == null) {
			center = new Center(true, getDimension(), getSource()).calcNew();
		}
		if (sigma == null) {
			sigma = new Std(getDimension(), true, center, true).calcNew();
		}
		switch (getDimension()) {
		case ALL:
			return center.getAsDouble(coordinates) / sigma.getAsDouble(0, 0);
		case ROW:
			return center.getAsDouble(coordinates) / sigma.getAsDouble(0, coordinates[COLUMN]);
		case COLUMN:
			return center.getAsDouble(coordinates) / sigma.getAsDouble(coordinates[ROW], 0);
		}
		return Double.NaN;
	}

}