Grid/lib/qcd/observables/plaquette.h

/*************************************************************************************

Grid physics library, www.github.com/paboyle/Grid

Source file: ./lib/qcd/modules/Registration.h

Copyright (C) 2017

Author: Guido Cossu <guido.cossu@ed.ac.uk>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

See the full license in the file "LICENSE" in the top level distribution
directory
*************************************************************************************/
/*  END LEGAL */

#ifndef HMC_PLAQUETTE_H
#define HMC_PLAQUETTE_H

namespace Grid {
namespace QCD {

// this is only defined for a gauge theory
template <class Impl>
class PlaquetteLogger : public HmcObservable<typename Impl::Field> {
 private:
  std::string Stem;

 public:
  // here forces the Impl to be of gauge fields
  // if not the compiler will complain
  INHERIT_GIMPL_TYPES(Impl);
  typedef typename Impl::Field Field;  // necessary for HmcObservable compatibility
  explicit PlaquetteLogger(std::string cf) { Stem = cf; }

  void TrajectoryComplete(int traj,
                          Field &U,
                          GridSerialRNG &sRNG,
                          GridParallelRNG &pRNG) {
    std::string file;
    {
      std::ostringstream os;
      os << Stem << "." << traj;
      file = os.str();
    }
    std::ofstream of(file);

    RealD peri_plaq = WilsonLoops<PeriodicGimplR>::avgPlaquette(U);
    RealD peri_rect = WilsonLoops<PeriodicGimplR>::avgRectangle(U);

    RealD impl_plaq = WilsonLoops<Impl>::avgPlaquette(U);
    RealD impl_rect = WilsonLoops<Impl>::avgRectangle(U);

    // Fixme reorganise this output
    of << traj << " " << impl_plaq << " " << impl_rect << "  " << peri_plaq
       << " " << peri_rect << std::endl;
    std::cout << GridLogMessage << "traj"
              << " "
              << "plaq "
              << " "
              << " rect  "
              << "  "
              << "peri_plaq"
              << " "
              << "peri_rect" << std::endl;
    std::cout << GridLogMessage << traj << " " << impl_plaq << " " << impl_rect
              << "  " << peri_plaq << " " << peri_rect << std::endl;
  }
};

}  // namespace QCD
}  // namespace Grid

#endif  // HMC_PLAQUETTE_H