action_F_Rational.h

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#ifndef ACTION_F_RATIONAL_INCLUDED
#define ACTION_F_RATIONAL_INCLUDED

#include "action.h"
#include "fopr_Rational.h"
#include "force_F_Rational.h"

#include "bridgeIO.h"
using Bridge::vout;


//- parameters class
class Parameters_Action_F_Rational : virtual public Parameters
{
 public:
  Parameters_Action_F_Rational();
};
//- end

class Action_F_Rational : public Action {
 private:
  // rational approximation parameters:
  int         m_Np;             // number of poles in rational approx.
  int         m_n_exp, m_d_exp; // numerator and denominator of the exponent
  double      m_x_min, m_x_max; // valid range of approximate sign function
  int         m_Niter;          // max iteration of shiftsolver
  double      m_Stop_cond;      // stopping condition of shift solver
  std::string m_label;          // label of action

  Fopr             *m_fopr;
  Force            *m_fopr_force;
  Fopr_Rational    *m_fopr_langev;
  Fopr_Rational    *m_fopr_H;
  Force_F_Rational *m_force_rational;

  Field *m_U;
  int   m_status_linkv;

  Field m_psf;
  Field m_force;


 public:
  Action_F_Rational(Fopr *fopr, Force *fopr_force) :
    Action()
  {
    m_fopr       = fopr;
    m_fopr_force = fopr_force;
  }

  ~Action_F_Rational()
  {
    tidyup();
  }

  void set_parameters(const Parameters& params);
  void set_parameters(int Np, int n_exp, int d_exp,
                      double x_min, double x_max,
                      int Niter, double Stop_cond);

  void set_label(std::string label)
  {
    m_label = label;
    vout.detailed(m_vl, "  label: %s\n", m_label.c_str());
  }

  std::string get_label()
  {
    return m_label;
  }

  void set_config(Field *U)
  {
    m_U = U;
    m_fopr->set_config(U);
  }

  void notify_linkv()
  {
    m_status_linkv = 0;
  }

  double langevin(RandomNumbers *);

  double calcH();

  const Field force();

 private:

  void setup();

  void tidyup();
};
#endif