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32 lines
765 B
C++
32 lines
765 B
C++
#include <iostream>
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#include <boost/array.hpp>
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#include <boost/numeric/odeint.hpp>
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using namespace std;
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using namespace boost::numeric::odeint;
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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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typedef boost::array< double , 3 > state_type;
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void lorenz( const state_type &x , state_type &dxdt , double t )
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{
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dxdt[0] = sigma * ( x[1] - x[0] );
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dxdt[1] = R * x[0] - x[1] - x[0] * x[2];
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dxdt[2] = -b * x[2] + x[0] * x[1];
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}
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void write_lorenz( const state_type &x , const double t )
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{
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cout << t << '\t' << x[0] << '\t' << x[1] << '\t' << x[2] << endl;
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}
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int main(int argc, char **argv)
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{
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state_type x = {{ 10.0 , 1.0 , 1.0 }}; // initial conditions
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integrate( lorenz , x , 0.0 , 25.0 , 0.1 , write_lorenz );
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}
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