fopr_Rational.h

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#ifndef FOPR_RATIONAL_INCLUDED
#define FOPR_RATIONAL_INCLUDED

#include "fopr.h"

#include "Field/field_G.h"
#include "Solver/shiftsolver_CG.h"
#include "Tools/math_Rational.h"

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


class Fopr_Rational : public Fopr
{
 public:
  static const std::string class_name;

 private:
  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

  Fopr *m_fopr;
  Shiftsolver_CG *m_solver;

  double m_a0;
  std::vector<double> m_cl;
  std::vector<double> m_bl;
  std::vector<Field> m_xq;

 public:
  Fopr_Rational(Fopr *fopr)
    : Fopr(), m_fopr(fopr) {}

  Fopr_Rational(unique_ptr<Fopr>& fopr)
    : Fopr(), m_fopr(fopr.get()) {}

  ~Fopr_Rational()
  {
    delete m_solver;
  }

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

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

  void set_config(unique_ptr<Field_G>& U)
  {
    m_fopr->set_config(U.get());
  }

  void mult(Field& v, const Field& f);

  void mult_dag(Field& v, const Field& f)
  {
    mult(v, f);
  }

  double func(const double x);

  int field_nvol() { return m_fopr->field_nvol(); }
  int field_nin() { return m_fopr->field_nin(); }
  int field_nex() { return m_fopr->field_nex(); }

 private:
  void init_parameters();

#ifdef USE_FACTORY
 private:
  static Fopr *create_object(Fopr *fopr)
  {
    return new Fopr_Rational(fopr);
  }

 public:
  static bool register_factory()
  {
    return Fopr::Factory_fopr::Register("Rational", create_object);
  }
#endif
};
#endif