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74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
/*
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Copyright 2017 IRIS AS
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This file is part of the Open Porous Media Project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#define BOOST_TEST_MODULE InvertSpecializationTest
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#include <boost/test/unit_test.hpp>
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#include <opm/simulators/linalg/MatrixBlock.hpp>
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void checkIdentity(Dune::FieldMatrix<double, 4, 4> M) {
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double diag = 0.0;
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double offDiag = 0.0;
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for (int i = 0; i < 4; ++i) {
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for (int j = 0; j < 4; ++j) {
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if (i == j)
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diag += M[i][j];
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else
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offDiag += M[i][j];
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}
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}
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BOOST_CHECK_CLOSE(4, diag, 1e-14);
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BOOST_CHECK_SMALL(offDiag, 1e-14);
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}
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BOOST_AUTO_TEST_CASE(Invert4x4)
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{
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typedef Dune::FieldMatrix<double, 4, 4> BaseType;
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BaseType matrix;
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BaseType inverse;
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for (int i = 0; i < 4; ++i) {
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for (int j = 0; j < 4; ++j) {
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matrix[i][j] = i + 4*j + 1;
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}
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}
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BaseType matrix_sing (matrix);
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// make matrix non-singular
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matrix[3][0] = 5;
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matrix[0][3] = 14;
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double det = Dune::FMatrixHelp::invertMatrix(matrix, inverse);
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BOOST_CHECK_CLOSE(4, det, 1e-14);
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// check matrix * inverse close to identiy
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checkIdentity(matrix.rightmultiply(inverse));
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// check return identity matrix if singular matrix
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inverse = 0.0;
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double det2 = Dune::FMatrixHelp::invertMatrix(matrix_sing, inverse);
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BOOST_CHECK_CLOSE(1.0, det2, 1e-14);
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checkIdentity(inverse);
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}
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