ODEINT output to txt file instead of console - c++

Question

Is there a way to write the outputs of t and x of this example to a txt file instead of the console. Thanks!
This is the example I copied from Odeint website.
#include <iostream>
#include <boost/numeric/odeint.hpp>
using namespace std;
using namespace boost::numeric::odeint;
/* we solve the simple ODE x' = 3/(2t^2) + x/(2t)
* with initial condition x(1) = 0.
* Analytic solution is x(t) = sqrt(t) - 1/t
*/
void rhs( const double x , double &dxdt , const double t )
{
dxdt = 3.0/(2.0*t*t) + x/(2.0*t);
}
void write_cout( const double &x , const double t )
{
cout << t << '\t' << x << endl;
}
// state_type = double
typedef runge_kutta_dopri5< double > stepper_type;
int main()
{
double x = 0.0;
integrate_adaptive( make_controlled( 1E-12 , 1E-12 , stepper_type() ) ,
rhs , x , 1.0 , 10.0 , 0.1 , write_cout );
}

Answer 1

you can simply pipe the output of this example into a text file
$ ./lorenz > data.txt
Otherwise you can use a C++ ofstreams to write the output directly into a file, e.g. described there: http://www.cplusplus.com/doc/tutorial/files/

Answer 2

just replace cout with object of ofstream.
#include <iostream>
#include <fstream>
#include <boost/numeric/odeint.hpp>
using namespace std;
using namespace boost::numeric::odeint;
ofstream data("data.txt");
/* we solve the simple ODE x' = 3/(2t^2) + x/(2t)
* with initial condition x(1) = 0.
* Analytic solution is x(t) = sqrt(t) - 1/t
*/
void rhs(const double x, double &dxdt, const double t)
{
dxdt = 3.0 / (2.0*t*t) + x / (2.0*t);
}
void write_cout(const double &x, const double t)
{
data << t << '\t' << x << endl;
}
// state_type = double
typedef runge_kutta_dopri5< double > stepper_type;
int main()
{
double x = 0.0;
integrate_adaptive(make_controlled(1E-12, 1E-12, stepper_type()),
rhs, x, 1.0, 10.0, 0.1, write_cout);
}