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/* -*- mia-c++ -*-
*
* This file is part of MIA - a toolbox for medical image analysis
* Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
*
* MIA 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.
*
* This program 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 MIA; if not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef BOOST_TEST_DYN_LINK
#define BOOST_TEST_DYN_LINK
#endif
#define BOOST_TEST_MAIN
#define BOOST_TEST_ALTERNATIVE_INIT_API
#include <boost/test/unit_test.hpp>
#include <boost/test/tools/floating_point_comparison.hpp>
#include <mia/core/gsl_pca.hh>
using namespace gsl;
BOOST_AUTO_TEST_CASE( test_matrix_pca )
{
const double input[50] = {
1, 2, 3, 2, 1,
2, 1, 2, 5, 2,
3, 2, 5, 2, 5,
2, 6, 2, 3, 8,
4, 1, 6, 2, 1,
4, 1, 2, 5, 5,
2, 2, 3, 8, 7,
2, 4, 8, 1, 4,
1, 2, 3, 2, 2,
5, 4, 2, 3, 3
};
Matrix m(10, 5, input);
PCA pca(3, 0.0);
auto result = pca.analyze(m.transposed());
BOOST_CHECK_EQUAL(result.eval.size(), 3u);
BOOST_CHECK_CLOSE(result.eval[0], 8.785043, 0.1);
BOOST_CHECK_CLOSE(result.eval[1], 5.462723, 0.1);
BOOST_CHECK_CLOSE(result.eval[2], 2.673904, 0.1);
BOOST_CHECK_EQUAL(result.evec.rows(), 5u);
BOOST_CHECK_EQUAL(result.evec.cols(), 3u);
// note that the sign is undefined, the test should honor this
const double test_ev[15] = {
0.01448099, -0.03862017, -0.07748999,
0.15538277, 0.55340859, 0.48156179,
-0.42010386, 0.47788917, -0.73357794,
0.55943565, -0.44087868, -0.42617084,
0.69727398, 0.51912941, -0.20575562
};
const double *t = test_ev;
for (unsigned r = 0; r < 5; ++r)
for (unsigned c = 0; c < 3; ++c, ++t) {
BOOST_CHECK_CLOSE(result.evec(r, c), *t, 0.1);
}
}
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