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Boost-Commit : |
Subject: [Boost-commit] svn:boost r71848 - in sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor: . lorenz_special taylor_v4
From: karsten.ahnert_at_[hidden]
Date: 2011-05-09 14:44:00
Author: karsten
Date: 2011-05-09 14:43:57 EDT (Mon, 09 May 2011)
New Revision: 71848
URL: http://svn.boost.org/trac/boost/changeset/71848
Log:
continuing taylor, cpp code is as fast as the fortran code, hehe
Text files modified:
sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/lorenz.nb | 253 +++++++++++++++++++++++++++++----------
sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/lorenz_special/lorenz_special.f | 10
sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/taylor_v4/taylor.hpp | 98 +++++++++------
sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/taylor_v4/taylor_main.cpp | 42 +++---
4 files changed, 275 insertions(+), 128 deletions(-)
Modified: sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/lorenz.nb
==============================================================================
--- sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/lorenz.nb (original)
+++ sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/lorenz.nb 2011-05-09 14:43:57 EDT (Mon, 09 May 2011)
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Modified: sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/lorenz_special/lorenz_special.f
==============================================================================
--- sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/lorenz_special/lorenz_special.f (original)
+++ sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/lorenz_special/lorenz_special.f 2011-05-09 14:43:57 EDT (Mon, 09 May 2011)
@@ -3,6 +3,8 @@
stop
end
+
+
Subroutine INTEGRATION
IMPLICIT REAL*8 (A-H,O-Z)
real*8 AX(77777),AY(77777),AZ(77777),AT(77777)
@@ -16,6 +18,8 @@
COMMON /ST/ DX,DY,DZ,Q,NO
INTEGER counter
+ open(9,file='lorenz.dat',status='unknown',access='sequential',
+ : form='formatted')
C Introduce the parameters:
P=10.d0
B=8.d0/3.d0
@@ -27,11 +31,9 @@
t=0.d0
tend=5000.d0
counter=0
- 10 xp=x
- yp=y
- zp=z
- call step (P,R,B,X,Y,Z,DT)
+10 call step (P,R,B,X,Y,Z,DT)
T=T+DT
+ write(9,'(4f20.11)') t,x,y,z
counter = counter + 1
if(t.lt.tend) goto 10
write(*,"(i8)")counter
Modified: sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/taylor_v4/taylor.hpp
==============================================================================
--- sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/taylor_v4/taylor.hpp (original)
+++ sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/taylor_v4/taylor.hpp 2011-05-09 14:43:57 EDT (Mon, 09 May 2011)
@@ -159,9 +159,13 @@
data_type data1( k , data.x , data.derivs , data.dt_fac );
data_type data2( data.which - k , data.x , data.derivs , data.dt_fac );
- tmp += boost::math::binomial_coefficient< double >( data.which , k )
- * Grammar()( proto::left( expr ) , state , data1 )
- * Grammar()( proto::right( expr ) , state , data2 );
+// tmp += boost::math::binomial_coefficient< double >( data.which , k )
+// * Grammar()( proto::left( expr ) , state , data1 )
+// * Grammar()( proto::right( expr ) , state , data2 );
+
+ tmp += Grammar()( proto::left( expr ) , state , data1 )
+ * Grammar()( proto::right( expr ) , state , data2 );
+
}
return tmp;
@@ -388,6 +392,8 @@
typedef state_type deriv_type;
typedef std::tr1::array< state_type , order_value > derivs_type;
+ taylor( void ) : m_derivs() , m_dt_fac( 1.0 ) { }
+
order_type order( void ) const
{
return order_value;
@@ -424,38 +430,41 @@
BOOST_STATIC_ASSERT(( boost::fusion::traits::is_sequence< System >::value ));
BOOST_STATIC_ASSERT(( size_t( boost::fusion::result_of::size< System >::value ) == dim ));
- double dt_fac = dt;
- eval_derivs( sys , in , m_derivs , dt_fac );
-
-// double max_error = 0.0;
-// for( size_t i=0 ; i<N ; ++i )
-// {
-// double error = std::abs( m_derivs[order_value-1][i] ) / ( std::abs( in[i] ) + 1.0e-35 );
-// max_error = std::max( error , max_error );
-// }
+ eval_derivs( sys , in , m_derivs , m_dt_fac );
-// dt = pow( dt0 / max_error , 1.0 / double( order_value ) );
+ double max_error = 0.0;
+ for( size_t i=0 ; i<dim ; ++i )
+ {
+ double error = std::abs( m_derivs[order_value-1][i] ) / ( std::abs( in[i] ) + 1.0e-35 );
+ max_error = std::max( error , max_error );
+ }
-// clog << dt << tab << dt0 << tab << max_error << tab << dt_fac << endl;
+ dt = pow( dt0 / max_error , 1.0 / double( order_value ) );
+// clog << dt << tab << max_error << tab << in[0] << tab << in[1] << tab << in[2] << tab;
+// clog << m_derivs[0][0] << tab << m_derivs[0][1] << tab << m_derivs[0][2] << tab << m_dt_fac << endl;
- for( size_t i=0 ; i<N ; ++i )
+ for( size_t i=0 ; i<dim ; ++i )
{
value_type tmp = 0.0;
for( size_t k=0 ; k<order_value ; ++k )
- tmp += 1.0 * ( tmp + m_derivs[order_value-1-k][i] );
+ tmp = dt * ( tmp + m_derivs[order_value-1-k][i] );
out[i] = in[i] + tmp;
}
+// clog << dt << tab << dt0 << tab << max_error << tab << m_dt_fac;
+// for( size_t j=0 ; j<dim ; ++j ) clog << tab << out[j];
+// clog << endl;
+
// clog << endl;
// for( size_t i=0 ; i<4 ; ++i )
// {
-// for( size_t j=0 ; j<N ; ++j )
+// for( size_t j=0 ; j<dim ; ++j )
// clog << m_derivs[i][j] << "\t";
// clog << endl;
// }
// clog << endl;
-// dt *= dt_fac;
+ dt *= m_dt_fac;
t += dt;
}
@@ -472,10 +481,15 @@
const double min_fac = 1.5;
const double max_fac = 0.6;
- for( size_t i=0 ; i<Order ; ++i )
+ for( size_t i=0 ; i<order_value ; ++i )
{
boost::mpl::for_each< boost::mpl::range_c< size_t , 0 , dim > >( make_eval_derivs( sys , in , der , dt_fac , i ) );
+// clog << i << tab << "Deriv : ";
+// for( size_t j=0 ; j<dim ; ++j )
+// clog << tab << der[i][j];
+// clog << endl;
+
/*
* OK # Fehler bestimmen
* OK # Fehler grenzen pruefen
@@ -483,25 +497,30 @@
* OK # dt_fac aendern
* OK # schon berechnete Ableitungen skalieren
*/
-// while( true )
-// {
-// double err = 0.0;
-// for( size_t j=0 ; j<N ; ++j ) err += std::abs( der[i][j] );
-//
-// if( err < min_error )
-// {
-// scale_derivs( der , i , min_fac );
-// dt_fac *= min_fac;
-// continue;
-// }
-// if( err > max_error )
-// {
-// scale_derivs( der , i , max_fac );
-// dt_fac *= max_fac;
-// continue;
-// }
-// break;
-// }
+ while( true )
+ {
+ double err = 0.0;
+ for( size_t j=0 ; j<dim ; ++j ) err += std::abs( der[i][j] );
+// clog << i;
+// for( size_t j=0 ; j<dim ; ++j ) clog << tab << der[i][j];
+// clog << tab << err << endl;
+
+ if( err < min_error )
+ {
+// clog << i << tab << "min_error : " << err << tab << dt_fac << endl;
+ scale_derivs( der , i , min_fac );
+ dt_fac *= min_fac;
+ continue;
+ }
+ if( err > max_error )
+ {
+// clog << i << tab << "max_error : " << err << tab << dt_fac << endl;
+ scale_derivs( der , i , max_fac );
+ dt_fac *= max_fac;
+ continue;
+ }
+ break;
+ }
}
@@ -513,7 +532,7 @@
for( size_t i=0 ; i<=order ; ++i )
{
scale *= fac;
- for( size_t j=0 ; j<N ; ++j )
+ for( size_t j=0 ; j<dim ; ++j )
der[i][j] *= scale;
}
}
@@ -523,6 +542,7 @@
private:
derivs_type m_derivs;
+ double m_dt_fac;
};
Modified: sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/taylor_v4/taylor_main.cpp
==============================================================================
--- sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/taylor_v4/taylor_main.cpp (original)
+++ sandbox/odeint/branches/karsten/libs/numeric/odeint/ideas/taylor/taylor_v4/taylor_main.cpp 2011-05-09 14:43:57 EDT (Mon, 09 May 2011)
@@ -6,6 +6,7 @@
*/
#include <iostream>
+#include <fstream>
#include "taylor.hpp"
@@ -19,7 +20,7 @@
return out;
}
-typedef boost::numeric::odeint::taylor< 3 , 10 > taylor_type;
+typedef boost::numeric::odeint::taylor< 3 , 25 > taylor_type;
typedef taylor_type::state_type state_type;
typedef taylor_type::derivs_type derivs_type;
@@ -50,22 +51,8 @@
state_type x = {{ 10.0 , 10.0 , 10.0 }} ;
double t = 0.0;
- double dt = 0.001;
- for( size_t i=0 ; i<10000 ; ++i )
- {
- stepper.try_step(
- fusion::make_vector
- (
- sigma * ( arg2 - arg1 ) ,
- R * arg1 - arg2 - arg1 * arg3 ,
- arg1 * arg2 - b * arg3
- ) ,
- x , t , dt );
- cout << i << "\t" << t << "\t" << x << "\n";
- }
-
-
-// while( t < 10.0 )
+ double dt = 1.0;
+// for( size_t i=0 ; i<10000 ; ++i )
// {
// stepper.try_step(
// fusion::make_vector
@@ -75,9 +62,26 @@
// arg1 * arg2 - b * arg3
// ) ,
// x , t , dt );
-//
-// cout << t << "\t" << x << endl;
+// cout << i << "\t" << t << "\t" << x << "\n";
// }
+ ofstream fout( "lorenz.dat" );
+ size_t count = 0;
+ while( t < 5000.0 )
+ {
+ stepper.try_step(
+ fusion::make_vector
+ (
+ sigma * ( arg2 - arg1 ) ,
+ R * arg1 - arg2 - arg1 * arg3 ,
+ arg1 * arg2 - b * arg3
+ ) ,
+ x , t , dt );
+
+ fout << t << "\t" << x << endl;
+ ++count;
+ }
+ clog << count << endl;
+
return 0;
}
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