| /* |
| |
| [begin_description] |
| Test case for issue 189: |
| Controlled Rosenbrock stepper fails to increase step size |
| [end_description] |
| |
| Copyright 2016 Karsten Ahnert |
| Copyright 2016 Mario Mulansky |
| |
| Distributed under the Boost Software License, Version 1.0. |
| (See accompanying file LICENSE_1_0.txt or |
| copy at http://www.boost.org/LICENSE_1_0.txt) |
| */ |
| |
| #define BOOST_TEST_MODULE odeint_regression_189 |
| |
| #include <boost/numeric/odeint.hpp> |
| |
| #include <boost/test/unit_test.hpp> |
| #include <boost/phoenix/core.hpp> |
| #include <boost/phoenix/operator.hpp> |
| |
| using namespace boost::numeric::odeint; |
| namespace phoenix = boost::phoenix; |
| |
| typedef boost::numeric::ublas::vector< double > vector_type; |
| typedef boost::numeric::ublas::matrix< double > matrix_type; |
| |
| struct stiff_system |
| { |
| void operator()( const vector_type &x , vector_type &dxdt , double /* t */ ) |
| { |
| dxdt[ 0 ] = -101.0 * x[ 0 ] - 100.0 * x[ 1 ]; |
| dxdt[ 1 ] = x[ 0 ]; |
| } |
| }; |
| |
| struct stiff_system_jacobi |
| { |
| void operator()( const vector_type & /* x */ , matrix_type &J , const double & /* t */ , vector_type &dfdt ) |
| { |
| J( 0 , 0 ) = -101.0; |
| J( 0 , 1 ) = -100.0; |
| J( 1 , 0 ) = 1.0; |
| J( 1 , 1 ) = 0.0; |
| dfdt[0] = 0.0; |
| dfdt[1] = 0.0; |
| } |
| }; |
| |
| |
| BOOST_AUTO_TEST_CASE( regression_189 ) |
| { |
| vector_type x( 2 , 1.0 ); |
| |
| size_t num_of_steps = integrate_const( make_dense_output< rosenbrock4< double > >( 1.0e-6 , 1.0e-6 ) , |
| std::make_pair( stiff_system() , stiff_system_jacobi() ) , |
| x , 0.0 , 50.0 , 0.01 , |
| std::cout << phoenix::arg_names::arg2 << " " << phoenix::arg_names::arg1[0] << "\n" ); |
| // regression: number of steps should be 74 |
| size_t num_of_steps_expected = 74; |
| BOOST_CHECK_EQUAL( num_of_steps , num_of_steps_expected ); |
| |
| vector_type x2( 2 , 1.0 ); |
| |
| size_t num_of_steps2 = integrate_const( make_dense_output< runge_kutta_dopri5< vector_type > >( 1.0e-6 , 1.0e-6 ) , |
| stiff_system() , x2 , 0.0 , 50.0 , 0.01 , |
| std::cout << phoenix::arg_names::arg2 << " " << phoenix::arg_names::arg1[0] << "\n" ); |
| num_of_steps_expected = 1531; |
| BOOST_CHECK_EQUAL( num_of_steps2 , num_of_steps_expected ); |
| } |