ceph/src/boost/libs/numeric/odeint/test/regression/regression_189.cpp

   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 {
  32     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 {
  41     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
  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 }