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Plugin to incorporate dense matrix classes from the jblas library
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/*
 * 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.jblas.calculation;

import org.jblas.DoubleMatrix;
import org.jblas.Singular;
import org.ujmp.core.Matrix;
import org.ujmp.core.interfaces.HasColumnMajorDoubleArray1D;
import org.ujmp.core.util.MathUtil;
import org.ujmp.jblas.JBlasDenseDoubleMatrix2D;

public class SVD implements org.ujmp.core.doublematrix.calculation.general.decomposition.SVD {

	public static SVD INSTANCE = new SVD();

	public Matrix[] calc(Matrix source) {
		final DoubleMatrix matrix;
		if (source instanceof JBlasDenseDoubleMatrix2D) {
			matrix = ((JBlasDenseDoubleMatrix2D) source).getWrappedObject();
		} else if (source instanceof HasColumnMajorDoubleArray1D) {
			matrix = new JBlasDenseDoubleMatrix2D(MathUtil.longToInt(source.getRowCount()), MathUtil.longToInt(source
					.getColumnCount()), ((HasColumnMajorDoubleArray1D) source).getColumnMajorDoubleArray1D())
					.getWrappedObject();
		} else {
			matrix = new JBlasDenseDoubleMatrix2D(source).getWrappedObject();
		}
		final DoubleMatrix[] svd = Singular.fullSVD(matrix);
		final Matrix u = new JBlasDenseDoubleMatrix2D(svd[0]);
		DoubleMatrix sVector = svd[1];
		final Matrix s = new JBlasDenseDoubleMatrix2D(MathUtil.longToInt(source.getRowCount()),
				MathUtil.longToInt(source.getColumnCount()));
		for (int i = 0; i < sVector.rows; i++) {
			s.setAsDouble(sVector.get(i), i, i);
		}
		final Matrix v = new JBlasDenseDoubleMatrix2D(svd[2]);
		return new Matrix[] { u, s, v };
	}

}