1 /*
2
3 [begin_description]
4 Test case for issue 189:
5 Controlled Rosenbrock stepper fails to increase step size
6 [end_description]
7
8 Copyright 2016 Karsten Ahnert
9 Copyright 2016 Mario Mulansky
10
11 Distributed under the Boost Software License, Version 1.0.
12 (See accompanying file LICENSE_1_0.txt or
13 copy at http://www.boost.org/LICENSE_1_0.txt)
14 */
15
16 #define BOOST_TEST_MODULE odeint_regression_189
17
18 #include <boost/numeric/odeint.hpp>
19
20 #include <boost/test/unit_test.hpp>
21 #include <boost/phoenix/core.hpp>
22 #include <boost/phoenix/operator.hpp>
23
24 using namespace boost::numeric::odeint;
25 namespace phoenix = boost::phoenix;
26
27 typedef boost::numeric::ublas::vector< double > vector_type;
28 typedef boost::numeric::ublas::matrix< double > matrix_type;
29
30 struct stiff_system
31 {
operator ()stiff_system32 void operator()( const vector_type &x , vector_type &dxdt , double /* t */ )
33 {
34 dxdt[ 0 ] = -101.0 * x[ 0 ] - 100.0 * x[ 1 ];
35 dxdt[ 1 ] = x[ 0 ];
36 }
37 };
38
39 struct stiff_system_jacobi
40 {
operator ()stiff_system_jacobi41 void operator()( const vector_type & /* x */ , matrix_type &J , const double & /* t */ , vector_type &dfdt )
42 {
43 J( 0 , 0 ) = -101.0;
44 J( 0 , 1 ) = -100.0;
45 J( 1 , 0 ) = 1.0;
46 J( 1 , 1 ) = 0.0;
47 dfdt[0] = 0.0;
48 dfdt[1] = 0.0;
49 }
50 };
51
52
BOOST_AUTO_TEST_CASE(regression_189)53 BOOST_AUTO_TEST_CASE( regression_189 )
54 {
55 vector_type x( 2 , 1.0 );
56
57 size_t num_of_steps = integrate_const( make_dense_output< rosenbrock4< double > >( 1.0e-6 , 1.0e-6 ) ,
58 std::make_pair( stiff_system() , stiff_system_jacobi() ) ,
59 x , 0.0 , 50.0 , 0.01 ,
60 std::cout << phoenix::arg_names::arg2 << " " << phoenix::arg_names::arg1[0] << "\n" );
61 // regression: number of steps should be 74
62 size_t num_of_steps_expected = 74;
63 BOOST_CHECK_EQUAL( num_of_steps , num_of_steps_expected );
64
65 vector_type x2( 2 , 1.0 );
66
67 size_t num_of_steps2 = integrate_const( make_dense_output< runge_kutta_dopri5< vector_type > >( 1.0e-6 , 1.0e-6 ) ,
68 stiff_system() , x2 , 0.0 , 50.0 , 0.01 ,
69 std::cout << phoenix::arg_names::arg2 << " " << phoenix::arg_names::arg1[0] << "\n" );
70 num_of_steps_expected = 1531;
71 BOOST_CHECK_EQUAL( num_of_steps2 , num_of_steps_expected );
72 }
73