comparison DEPENDENCIES/generic/include/boost/numeric/odeint/integrate/detail/integrate_adaptive.hpp @ 16:2665513ce2d3

Add boost headers

+/*
+ [auto_generated]
+ boost/numeric/odeint/integrate/detail/integrate_adaptive.hpp
+
+ [begin_description]
+ Default Integrate adaptive implementation.
+ [end_description]
+
+ Copyright 2009-2011 Karsten Ahnert
+ Copyright 2009-2011 Mario Mulansky
+
+ 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_ADAPTIVE_HPP_INCLUDED
+#define BOOST_NUMERIC_ODEINT_INTEGRATE_DETAIL_INTEGRATE_ADAPTIVE_HPP_INCLUDED
+
+#include <stdexcept>
+
+#include <boost/numeric/odeint/stepper/stepper_categories.hpp>
+#include <boost/numeric/odeint/stepper/controlled_step_result.hpp>
+#include <boost/numeric/odeint/integrate/detail/integrate_n_steps.hpp>
+#include <boost/numeric/odeint/util/bind.hpp>
+#include <boost/numeric/odeint/util/unwrap_reference.hpp>
+#include <boost/numeric/odeint/util/copy.hpp>
+
+#include <boost/numeric/odeint/util/detail/less_with_sign.hpp>
+
+
+#include <iostream>
+
+namespace boost {
+namespace numeric {
+namespace odeint {
+namespace detail {
+
+// forward declaration
+template< class Stepper , class System , class State , class Time , class Observer>
+Time integrate_n_steps(
+        Stepper stepper , System system , State &start_state ,
+        Time start_time , Time dt , size_t num_of_steps ,
+        Observer observer , stepper_tag );
+
+/*
+ * integrate_adaptive for simple stepper is basically an integrate_const + some last step
+ */
+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 , stepper_tag
+)
+{
+    size_t steps = static_cast< size_t >( (end_time-start_time)/dt );
+    Time end = detail::integrate_n_steps( stepper , system , start_state , start_time ,
+                                          dt , steps , observer , stepper_tag() );
+    if( less_with_sign( end , end_time , dt ) )
+    {   //make a last step to end exactly at end_time
+        stepper.do_step( system , start_state , end , end_time - end );
+        steps++;
+        typename odeint::unwrap_reference< Observer >::type &obs = observer;
+        obs( start_state , end_time );
+    }
+    return steps;
+}
+
+
+/*
+ * classical integrate adaptive
+ */
+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
+)
+{
+    typename odeint::unwrap_reference< Observer >::type &obs = observer;
+
+    const size_t max_attempts = 1000;
+    const char *error_string = "Integrate adaptive : Maximal number of iterations reached. A step size could not be found.";
+    size_t count = 0;
+    while( less_with_sign( start_time , end_time , dt ) )
+    {
+        obs( start_state , start_time );
+        if( less_with_sign( end_time , start_time + dt , dt ) )
+        {
+            dt = end_time - start_time;
+        }
+
+        size_t trials = 0;
+        controlled_step_result res = success;
+        do
+        {
+            res = stepper.try_step( system , start_state , start_time , dt );
+            ++trials;
+        }
+        while( ( res == fail ) && ( trials < max_attempts ) );
+        if( trials == max_attempts ) throw std::overflow_error( error_string );
+
+        ++count;
+    }
+    obs( start_state , start_time );
+    return count;
+}
+
+
+/*
+ * integrate adaptive for dense output steppers
+ *
+ * step size control is used if the stepper supports it
+ */
+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 , dense_output_stepper_tag )
+{
+    typename odeint::unwrap_reference< Observer >::type &obs = observer;
+
+    size_t count = 0;
+    stepper.initialize( start_state , start_time , dt );
+
+    while( less_with_sign( stepper.current_time() , end_time , stepper.current_time_step() ) )
+    {
+        while( less_eq_with_sign( stepper.current_time() + stepper.current_time_step() ,
+               end_time ,
+               stepper.current_time_step() ) )
+        {   //make sure we don't go beyond the end_time
+            obs( stepper.current_state() , stepper.current_time() );
+            stepper.do_step( system );
+            ++count;
+        }
+        stepper.initialize( stepper.current_state() , stepper.current_time() , end_time - stepper.current_time() );
+    }
+    obs( stepper.current_state() , stepper.current_time() );
+    // overwrite start_state with the final point
+    boost::numeric::odeint::copy( stepper.current_state() , start_state );
+    return count;
+}
+
+
+
+
+} // namespace detail
+} // namespace odeint
+} // namespace numeric
+} // namespace boost
+
+
+#endif // BOOST_NUMERIC_ODEINT_INTEGRATE_DETAIL_INTEGRATE_ADAPTIVE_HPP_INCLUDED