[GiNaC-list] real and imaginary parts of an expression

[Martin DRUON]

hello,

I would like to know how I can get the real part and the imaginary part of an expression (GiNaC::ex)...

for example :

#include <iostream>
#include <ginac/ginac.h>

using namespace GiNaC;

int main(int argc, char **argv)
{
  symbol x("x"), y("y");  // My complex number : x + iy
  symbol Q("Q"), a("a");  // Parameters

  // My expression
  ex f = (Q / 2 * Pi) * log(((x + I * y) - a) / ((x + I * y) + a));

  std::cout << f << std::endl;

//  f.real() -> How I can get real part ???
//  f.imag() -> How I can get imaginary part ???

  return EXIT_SUCCESS;
}


Is it possible easily ?

Thanks

Martin