/*
* Copyright (C) 2003-2006 Bjørn-Ove Heimsund
*
* This file is part of MTJ.
*
* This library 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 2.1 of the License, or (at your
* option) any later version.
*
* This library 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 this library; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package no.uib.cipr.matrix.sparse;
import no.uib.cipr.matrix.SymmDenseEVD;
import no.uib.cipr.matrix.sparse.FlexCompRowMatrix;
import no.uib.cipr.matrix.Utilities;
/**
* Test of iterative solvers for SPD matrices
*/
public abstract class SPDIterativeSolverTestAbstract extends IterativeSolverTestAbstract {
public SPDIterativeSolverTestAbstract(String arg0) {
super(arg0);
}
@Override
protected void createMatrix() throws Exception {
// Create a symmetrical matrix
int n = Utilities.getInt(1, max);
int b = Utilities.getInt(Math.min(bmax, n));
A = new FlexCompRowMatrix(n, n);
Utilities.symmetryPopulate(A, b);
// Need positive eigenvalues
addDiagonal(A, shift);
SymmDenseEVD evd = SymmDenseEVD.factorize(A);
while (n > 0 && evd.getEigenvalues()[0] <= 0) {
addDiagonal(A, shift);
evd = SymmDenseEVD.factorize(A);
}
}
}