Passing runtime parameters to odeint integrator

Question

I would like to use the odeint boost integrator to look at geodesic curves in the Kerr spacetime. This necessitates running an integrator for a variety of parameter values (

Answer 1

You can pass runtime parameters to the system function defining your ODE:

struct ode
{
    double param;
    ode( double param ) : m_param( param ) {}

    void operator()( state_type const& x , state_type& dxdt , time_type t ) const 
    {
        // your ode
    }
};

integrate_const( stepper {} , ode { 0.1 } , x , t_start , t_end , dt , observer );

Answer 2

I ran into a similar problem. What I did was defined global vars so that my function could access the variable I passed via argvs. Let me know if you need example.