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105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
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/*
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[auto_generated]
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libs/numeric/odeint/test/generic_stepper.cpp
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[begin_description]
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This file tests the generic stepper.
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[end_description]
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Copyright 2011 Mario Mulansky
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Copyright 2012 Karsten Ahnert
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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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// disable checked iterator warning for msvc
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#include <boost/config.hpp>
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#ifdef BOOST_MSVC
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#pragma warning(disable:4996)
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#endif
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#define BOOST_TEST_MODULE odeint_generic_stepper
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#include <iostream>
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#include <utility>
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#include <boost/test/unit_test.hpp>
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#include <boost/numeric/odeint/stepper/explicit_generic_rk.hpp>
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#include <boost/numeric/odeint/stepper/runge_kutta4.hpp>
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#include <boost/numeric/odeint/stepper/runge_kutta4_classic.hpp>
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#include <boost/array.hpp>
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using namespace boost::unit_test;
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using namespace boost::numeric::odeint;
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namespace fusion = boost::fusion;
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typedef double value_type;
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typedef boost::array< value_type , 2 > state_type;
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void sys( const state_type &x , state_type &dxdt , const value_type &t )
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{
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dxdt[ 0 ] = x[ 0 ] + 2 * x[ 1 ];
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dxdt[ 1 ] = x[ 1 ];
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}
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typedef explicit_generic_rk< 4 , 4 , state_type> rk_generic_type;
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typedef runge_kutta4< state_type > rk4_generic_type;
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const boost::array< double , 1 > a1 = {{ 0.5 }};
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const boost::array< double , 2 > a2 = {{ 0.0 , 0.5 }};
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const boost::array< double , 3 > a3 = {{ 0.0 , 0.0 , 1.0 }};
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const rk_generic_type::coef_a_type a = fusion::make_vector( a1 , a2 , a3 );
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const rk_generic_type::coef_b_type b = {{ 1.0/6 , 1.0/3 , 1.0/3 , 1.0/6 }};
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const rk_generic_type::coef_c_type c = {{ 0.0 , 0.5 , 0.5 , 1.0 }};
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typedef runge_kutta4_classic< state_type > rk4_type;
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BOOST_AUTO_TEST_SUITE( generic_stepper_test )
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BOOST_AUTO_TEST_CASE( test_generic_stepper )
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{
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//simultaneously test copying
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rk_generic_type rk_generic_( a , b , c );
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rk_generic_type rk_generic = rk_generic_;
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rk4_generic_type rk4_generic_;
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rk4_generic_type rk4_generic = rk4_generic_;
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//std::cout << stepper;
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rk4_type rk4_;
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rk4_type rk4 = rk4_;
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typedef rk_generic_type::state_type state_type;
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typedef rk_generic_type::value_type stepper_value_type;
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typedef rk_generic_type::deriv_type deriv_type;
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typedef rk_generic_type::time_type time_type;
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state_type x = {{ 0.0 , 1.0 }};
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state_type y = x;
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state_type z = x;
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rk_generic.do_step( sys , x , 0.0 , 0.1 );
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rk4_generic.do_step( sys , y , 0.0 , 0.1 );
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rk4.do_step( sys , z , 0.0 , 0.1 );
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BOOST_CHECK_NE( 0.0 , x[0] );
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BOOST_CHECK_NE( 1.0 , x[1] );
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// compare with analytic solution of above system
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BOOST_CHECK_EQUAL( x[0] , y[0] );
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BOOST_CHECK_EQUAL( x[1] , y[1] );
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BOOST_CHECK_EQUAL( x[0] , z[0] );
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BOOST_CHECK_EQUAL( x[1] , z[1] );
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}
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BOOST_AUTO_TEST_SUITE_END()
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