Squashed 'third_party/boostorg/odeint/' content from commit 6ff2719
Change-Id: If4892e29c1a5e6cf3a7aa51486a2725c251b0c7d
git-subtree-dir: third_party/boostorg/odeint
git-subtree-split: 6ff2719b6907b86596c3d43e88c1bcfdf29df560
diff --git a/examples/vexcl/Jamfile.v2 b/examples/vexcl/Jamfile.v2
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+# Copyright 2012 Karsten Ahnert
+# Copyright 2013 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)
+
+
+import boost ;
+import os ;
+
+boost.use-project ;
+
+
+# change these lines to fit you configuration
+local HOME = [ os.environ HOME ] ;
+local VEXCL_INCLUDE = [ os.environ VEXCL_ROOT ] ;
+OPENCL_INCLUDE = /usr/local/cuda/include ;
+
+
+
+lib opencl : : <name>OpenCL ;
+
+project : requirements
+ <implicit-dependency>/boost//headers
+ <include>$(VEXCL_INCLUDE)
+ <include>$(OPENCL_INCLUDE)
+ <toolset>gcc:<cxxflags>-std=c++0x
+ <library>/boost//system/
+ ;
+
+exe lorenz_ensemble : lorenz_ensemble.cpp opencl ;
\ No newline at end of file
diff --git a/examples/vexcl/lorenz_ensemble.cpp b/examples/vexcl/lorenz_ensemble.cpp
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+/*
+ * Copyright 2012 Karsten Ahnert
+ * Copyright 2013 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)
+ */
+
+#include <iostream>
+#include <vector>
+
+#include <vexcl/vexcl.hpp>
+
+#include <boost/numeric/odeint.hpp>
+//[ vexcl_includes
+#include <boost/numeric/odeint/external/vexcl/vexcl.hpp>
+//]
+
+namespace odeint = boost::numeric::odeint;
+
+//[ vexcl_state_types
+typedef vex::vector< double > vector_type;
+typedef vex::multivector< double, 3 > state_type;
+//]
+
+
+//[ vexcl_system
+const double sigma = 10.0;
+const double b = 8.0 / 3.0;
+
+struct sys_func
+{
+ const vector_type &R;
+
+ sys_func( const vector_type &_R ) : R( _R ) { }
+
+ void operator()( const state_type &x , state_type &dxdt , double t ) const
+ {
+ dxdt(0) = -sigma * ( x(0) - x(1) );
+ dxdt(1) = R * x(0) - x(1) - x(0) * x(2);
+ dxdt(2) = - b * x(2) + x(0) * x(1);
+ }
+};
+//]
+
+
+int main( int argc , char **argv )
+{
+ using namespace std;
+ using namespace odeint;
+
+ //[ vexcl_main
+ // setup the opencl context
+ vex::Context ctx( vex::Filter::Type(CL_DEVICE_TYPE_GPU) );
+ std::cout << ctx << std::endl;
+
+ // set up number of system, time step and integration time
+ const size_t n = 1024 * 1024;
+ const double dt = 0.01;
+ const double t_max = 1000.0;
+
+ // initialize R
+ double Rmin = 0.1 , Rmax = 50.0 , dR = ( Rmax - Rmin ) / double( n - 1 );
+ std::vector<double> x( n * 3 ) , r( n );
+ for( size_t i=0 ; i<n ; ++i ) r[i] = Rmin + dR * double( i );
+ vector_type R( ctx.queue() , r );
+
+ // initialize the state of the lorenz ensemble
+ state_type X(ctx.queue(), n);
+ X(0) = 10.0;
+ X(1) = 10.0;
+ X(2) = 10.0;
+
+ // create a stepper
+ runge_kutta4< state_type > stepper;
+
+ // solve the system
+ integrate_const( stepper , sys_func( R ) , X , 0.0 , t_max , dt );
+ //]
+
+ std::vector< double > res( 3 * n );
+ vex::copy( X(0) , res );
+ for( size_t i=0 ; i<n ; ++i )
+ cout << r[i] << "\t" << res[i] << "\t" << "\n";
+}