/*
* 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.mtj.calculation;
import no.uib.cipr.matrix.DenseMatrix;
import no.uib.cipr.matrix.Matrices;
import org.ujmp.core.Coordinates;
import org.ujmp.core.Matrix;
import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation;
import org.ujmp.mtj.MTJDenseDoubleMatrix2D;
public class Inv extends AbstractDoubleCalculation {
private static final long serialVersionUID = 1441735603598847485L;
private Matrix inv = null;
public Inv(Matrix matrix) {
super(matrix);
}
public double getDouble(long... coordinates) {
if (inv == null) {
DenseMatrix A = new MTJDenseDoubleMatrix2D(getSource()).getWrappedObject();
DenseMatrix I = Matrices.identity((int) getSource().getColumnCount());
DenseMatrix AI = I.copy();
inv = new MTJDenseDoubleMatrix2D((DenseMatrix) A.solve(I, AI));
}
return inv.getAsDouble(coordinates);
}
public long[] getSize() {
return Coordinates.transpose(getSource().getSize());
}
}