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/*
Copyright 2017 IRIS AS
This file is part of the Open Porous Media Project (OPM).
OPM is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OPM 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with OPM. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#define BOOST_TEST_MODULE InvertSpecializationTest
#include <boost/test/unit_test.hpp>
#include <opm/simulators/linalg/matrixblock.hh>
void checkIdentity(Dune::FieldMatrix<double, 4, 4> M) {
double diag = 0.0;
double offDiag = 0.0;
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 4; ++j) {
if (i == j)
diag += M[i][j];
else
offDiag += M[i][j];
}
}
BOOST_CHECK_CLOSE(4, diag, 1e-14);
BOOST_CHECK_SMALL(offDiag, 1e-14);
}
BOOST_AUTO_TEST_CASE(Invert4x4)
{
using BaseType = Dune::FieldMatrix<double, 4, 4>;
BaseType matrix;
BaseType inverse;
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 4; ++j) {
matrix[i][j] = i + 4*j + 1;
}
}
BaseType matrix_sing (matrix);
// make matrix non-singular
matrix[3][0] = 5;
matrix[0][3] = 14;
double det = Opm::detail::invertMatrix4<Opm::detail::FMat4>(matrix, inverse);
BOOST_CHECK_CLOSE(4, det, 1e-14);
// check matrix * inverse close to identiy
checkIdentity(matrix.rightmultiply(inverse));
// check singular matrix
BOOST_CHECK_THROW(Opm::detail::invertMatrix4<Opm::detail::FMat4>(matrix_sing, inverse),
Opm::NumericalProblem);
}
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