123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167 |
- /*
- [auto_generated]
- boost/numeric/odeint/integrate/detail/integrate_const.hpp
- [begin_description]
- integrate const implementation
- [end_description]
- Copyright 2012-2015 Mario Mulansky
- Copyright 2012 Christoph Koke
- Copyright 2012 Karsten Ahnert
- 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)
- */
- #ifndef BOOST_NUMERIC_ODEINT_INTEGRATE_DETAIL_INTEGRATE_CONST_HPP_INCLUDED
- #define BOOST_NUMERIC_ODEINT_INTEGRATE_DETAIL_INTEGRATE_CONST_HPP_INCLUDED
- #include <boost/numeric/odeint/util/unwrap_reference.hpp>
- #include <boost/numeric/odeint/stepper/stepper_categories.hpp>
- #include <boost/numeric/odeint/util/unit_helper.hpp>
- #include <boost/numeric/odeint/integrate/detail/integrate_adaptive.hpp>
- #include <boost/numeric/odeint/util/detail/less_with_sign.hpp>
- namespace boost {
- namespace numeric {
- namespace odeint {
- namespace detail {
- // forward declaration
- template< class Stepper , class System , class State , class Time , class Observer >
- size_t integrate_adaptive(
- Stepper stepper , System system , State &start_state ,
- Time &start_time , Time end_time , Time &dt ,
- Observer observer , controlled_stepper_tag
- );
- template< class Stepper , class System , class State , class Time , class Observer >
- size_t integrate_const(
- Stepper stepper , System system , State &start_state ,
- Time start_time , Time end_time , Time dt ,
- Observer observer , stepper_tag
- )
- {
- typename odeint::unwrap_reference< Observer >::type &obs = observer;
- typename odeint::unwrap_reference< Stepper >::type &st = stepper;
- Time time = start_time;
- int step = 0;
- // cast time+dt explicitely in case of expression templates (e.g. multiprecision)
- while( less_eq_with_sign( static_cast<Time>(time+dt) , end_time , dt ) )
- {
- obs( start_state , time );
- st.do_step( system , start_state , time , dt );
- // direct computation of the time avoids error propagation happening when using time += dt
- // we need clumsy type analysis to get boost units working here
- ++step;
- time = start_time + static_cast< typename unit_value_type<Time>::type >(step) * dt;
- }
- obs( start_state , time );
- return step;
- }
- template< class Stepper , class System , class State , class Time , class Observer >
- size_t integrate_const(
- Stepper stepper , System system , State &start_state ,
- Time start_time , Time end_time , Time dt ,
- Observer observer , controlled_stepper_tag
- )
- {
- typename odeint::unwrap_reference< Observer >::type &obs = observer;
- Time time = start_time;
- const Time time_step = dt;
- int real_steps = 0;
- int step = 0;
-
- while( less_eq_with_sign( static_cast<Time>(time+time_step) , end_time , dt ) )
- {
- obs( start_state , time );
- // integrate_adaptive_checked uses the given checker to throw if an overflow occurs
- real_steps += detail::integrate_adaptive(stepper, system, start_state, time,
- static_cast<Time>(time + time_step), dt,
- null_observer(), controlled_stepper_tag());
- // direct computation of the time avoids error propagation happening when using time += dt
- // we need clumsy type analysis to get boost units working here
- step++;
- time = start_time + static_cast< typename unit_value_type<Time>::type >(step) * time_step;
- }
- obs( start_state , time );
- return real_steps;
- }
- template< class Stepper , class System , class State , class Time , class Observer >
- size_t integrate_const(
- Stepper stepper , System system , State &start_state ,
- Time start_time , Time end_time , Time dt ,
- Observer observer , dense_output_stepper_tag
- )
- {
- typename odeint::unwrap_reference< Observer >::type &obs = observer;
- typename odeint::unwrap_reference< Stepper >::type &st = stepper;
- Time time = start_time;
-
- st.initialize( start_state , time , dt );
- obs( start_state , time );
- time += dt;
- int obs_step( 1 );
- int real_step( 0 );
-
- while( less_eq_with_sign( static_cast<Time>(time+dt) , end_time , dt ) )
- {
- while( less_eq_with_sign( time , st.current_time() , dt ) )
- {
- st.calc_state( time , start_state );
- obs( start_state , time );
- ++obs_step;
- // direct computation of the time avoids error propagation happening when using time += dt
- // we need clumsy type analysis to get boost units working here
- time = start_time + static_cast< typename unit_value_type<Time>::type >(obs_step) * dt;
- }
- // we have not reached the end, do another real step
- if( less_with_sign( static_cast<Time>(st.current_time()+st.current_time_step()) ,
- end_time ,
- st.current_time_step() ) )
- {
- while( less_eq_with_sign( st.current_time() , time , dt ) )
- {
- st.do_step( system );
- ++real_step;
- }
- }
- else if( less_with_sign( st.current_time() , end_time , st.current_time_step() ) )
- { // do the last step ending exactly on the end point
- st.initialize( st.current_state() , st.current_time() , end_time - st.current_time() );
- st.do_step( system );
- ++real_step;
- }
-
- }
- // last observation, if we are still in observation interval
- // might happen due to finite precision problems when computing the the time
- if( less_eq_with_sign( time , end_time , dt ) )
- {
- st.calc_state( time , start_state );
- obs( start_state , time );
- }
-
- return real_step;
- }
- } } } }
- #endif
|