Merge commit '4ebe6417a5fce5f0994fc0c31bebf732be96a07c' as 'boost'

2026-06-07 08:24:53 -04:00 · 2018-06-09 21:48:33 +01:00
parent b5eabc6d6a 4ebe6417a5
commit 5abe797e3c
12444 changed files with 2327021 additions and 0 deletions
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+/*
+ * rosenbrock4.cpp
+ *
+ * Copyright 2010-2012 Mario Mulansky
+ * Copyright 2011-2012 Karsten Ahnert
+ * Copyright 2012 Andreas Angelopoulos
+ *
+ * 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)
+ */
+
+#include <iostream>
+#include <fstream>
+#include <utility>
+
+#include <boost/numeric/odeint.hpp>
+
+#include <boost/phoenix/core.hpp>
+
+#include <boost/phoenix/core.hpp>
+#include <boost/phoenix/operator.hpp>
+
+using namespace std;
+using namespace boost::numeric::odeint;
+namespace phoenix = boost::phoenix;
+
+
+
+//[ stiff_system_definition
+typedef boost::numeric::ublas::vector< double > vector_type;
+typedef boost::numeric::ublas::matrix< double > matrix_type;
+
+struct stiff_system
+{
+    void operator()( const vector_type &x , vector_type &dxdt , double /* t */ )
+    {
+        dxdt[ 0 ] = -101.0 * x[ 0 ] - 100.0 * x[ 1 ];
+        dxdt[ 1 ] = x[ 0 ];
+    }
+};
+
+struct stiff_system_jacobi
+{
+    void operator()( const vector_type & /* x */ , matrix_type &J , const double & /* t */ , vector_type &dfdt )
+    {
+        J( 0 , 0 ) = -101.0;
+        J( 0 , 1 ) = -100.0;
+        J( 1 , 0 ) = 1.0;
+        J( 1 , 1 ) = 0.0;
+        dfdt[0] = 0.0;
+        dfdt[1] = 0.0;
+    }
+};
+//]
+
+
+
+/*
+//[ stiff_system_alternative_definition
+typedef boost::numeric::ublas::vector< double > vector_type;
+typedef boost::numeric::ublas::matrix< double > matrix_type;
+
+struct stiff_system
+{
+    template< class State >
+    void operator()( const State &x , State &dxdt , double t )
+    {
+        ...
+    }
+};
+
+struct stiff_system_jacobi
+{
+    template< class State , class Matrix >
+    void operator()( const State &x , Matrix &J , const double &t , State &dfdt )
+    {
+        ...
+    }
+};
+//]
+ */
+
+
+
+int main( int argc , char **argv )
+{
+//    typedef rosenbrock4< double > stepper_type;
+//    typedef rosenbrock4_controller< stepper_type > controlled_stepper_type;
+//    typedef rosenbrock4_dense_output< controlled_stepper_type > dense_output_type;
+    //[ integrate_stiff_system
+    vector_type x( 2 , 1.0 );
+
+    size_t num_of_steps = integrate_const( make_dense_output< rosenbrock4< double > >( 1.0e-6 , 1.0e-6 ) ,
+            make_pair( stiff_system() , stiff_system_jacobi() ) ,
+            x , 0.0 , 50.0 , 0.01 ,
+            cout << phoenix::arg_names::arg2 << " " << phoenix::arg_names::arg1[0] << "\n" );
+    //]
+    clog << num_of_steps << endl;
+
+
+
+//    typedef runge_kutta_dopri5< vector_type > dopri5_type;
+//    typedef controlled_runge_kutta< dopri5_type > controlled_dopri5_type;
+//    typedef dense_output_runge_kutta< controlled_dopri5_type > dense_output_dopri5_type;
+    //[ integrate_stiff_system_alternative
+
+    vector_type x2( 2 , 1.0 );
+
+    size_t num_of_steps2 = integrate_const( make_dense_output< runge_kutta_dopri5< vector_type > >( 1.0e-6 , 1.0e-6 ) ,
+            stiff_system() , x2 , 0.0 , 50.0 , 0.01 ,
+            cout << phoenix::arg_names::arg2 << " " << phoenix::arg_names::arg1[0] << "\n" );
+    //]
+    clog << num_of_steps2 << endl;
+
+
+    return 0;
+}