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muSpectre/tests/test_eigen_tools.cc
7d0715fa3a89bugfix/T2542

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test_eigen_tools.cc
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/**
* @file test_eigen_tools.cc
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 07 Mar 2018
*
* @brief test the eigen_tools
*
* Copyright © 2018 Till Junge
*
* µSpectre 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, or (at
* your option) any later version.
*
* µSpectre 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 GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "common/eigen_tools.hh"
#include "tests.hh"
namespace muSpectre {
BOOST_AUTO_TEST_SUITE(eigen_tools);
BOOST_AUTO_TEST_CASE(exponential_test) {
using Mat_t = Eigen::Matrix<Real, threeD, threeD>;
Mat_t input{};
input << 0, .25*pi, 0,
.25*pi, 0, 0,
0, 0, 1;
Mat_t output{};
output << 1.32460909, 0.86867096, 0,
0.86867096, 1.32460909, 0,
0, 0, 2.71828183;
auto my_output{expm(input)};
Real error{(my_output-output).norm()};
BOOST_CHECK_LT(error, 1e-8);
if (error >= 1e-8) {
std::cout << "input:" << std::endl << input << std::endl;
std::cout << "output:" << std::endl << output << std::endl;
std::cout << "my_output:" << std::endl << my_output << std::endl;
}
}
BOOST_AUTO_TEST_SUITE_END();
} // muSpectre
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