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