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59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
/* Boost check_gmp.cpp test file
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Copyright 2010-2011 Karsten Ahnert
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Copyright 2011 Mario Mulansky
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This file tests the odeint library with the gmp arbitrary precision types
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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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#define BOOST_TEST_MODULE odeint_gsl
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#include <gsl/gsl_vector.h>
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#include <boost/numeric/odeint/stepper/euler.hpp>
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#include <boost/numeric/odeint/external/gsl/gsl_wrapper.hpp>
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#include <boost/test/unit_test.hpp>
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using namespace boost::unit_test;
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using namespace boost::numeric::odeint;
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typedef gsl_vector *state_type;
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const double sigma = 10.0;
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const double R = 28.0;
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const double b = 8.0 / 3.0;
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void lorenz( const state_type x , state_type dxdt , double t )
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{
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gsl_vector_set( dxdt , 0 , sigma * ( gsl_vector_get(x , 1 ) - gsl_vector_get( x , 0 ) ) );
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gsl_vector_set( dxdt , 1 , R * gsl_vector_get( x , 0 ) - gsl_vector_get( x , 1 ) - gsl_vector_get( x , 0 ) * gsl_vector_get( x , 2) );
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gsl_vector_set( dxdt , 2 , gsl_vector_get( x , 0 ) * gsl_vector_get( x , 1 ) - b * gsl_vector_get( x , 2) );
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}
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BOOST_AUTO_TEST_CASE( gsl )
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{
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euler< state_type > euler;
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state_type x = gsl_vector_alloc( 3 );
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// check resizing
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state_type y = 0;
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boost::numeric::odeint::resize( y , x );
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BOOST_CHECK( 0 != y );
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gsl_vector_set( x , 0 , 1.0);
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gsl_vector_set( x , 1 , 1.0);
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gsl_vector_set( x , 2 , 2.0);
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euler.do_step( lorenz , x , 0.0 , 0.1 );
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//cout << gsl_vector_get( x , 0 ) << " " << gsl_vector_get( x , 1 ) << " " << gsl_vector_get( x , 2 ) << endl;
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gsl_vector_free( x );
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}
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