/Users/mdipierro/fermiqcd/development/Libraries/fermiqcd_fermi_propagator.h

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class fermi_propagator: public mdp_complex_field {
public:
  int   nspin, nc;
  fermi_propagator() {
    reset_field();
  };
  fermi_propagator(mdp_lattice &mylattice, int nc_, int nspin_=4) {
    reset_field();
    nspin=nspin_;
    nc=nc_;
    allocate_field(mylattice, nspin*nspin*nc*nc);
  };
  void allocate_fermi_propagator(mdp_lattice &mylattice, 
                                 int nc_, int nspin_=4) {
    deallocate_field();
    nspin=nspin_;
    nc=nc_;
    allocate_field(mylattice, nspin*nspin*nc*nc);
  };
  inline mdp_matrix operator() (site x, int a, int b) {
    mdp_matrix tmp(address(x,(a*nspin+b)*nc*nc), nc, nc);
    return tmp;
  };
  inline mdp_complex &operator() (site x, int a, int b, int i, int j) {
    return *(address(x,((a*nspin+b)*nc+i)*nc+j));
  };
  friend void generate(fermi_propagator &S, gauge_field &U,
                       coefficients &coeff,
                       mdp_real absolute_precision=fermi_inversion_precision,
                       mdp_real relative_precision=0,
                       int max_steps=2000,
                       void (*smf)(fermi_field&,
                                   gauge_field&,
                                   coefficients&)=0,
                       coefficients smear_coeff=coefficients(),
                       int comp=0) {
    fermi_field psi(S.lattice(),S.nc,S.nspin);
    fermi_field chi(S.lattice(),S.nc,S.nspin);
    site        x(S.lattice());
    int i,j,a,b;
    double time=mpi.time();
    inversion_stats stats;
    begin_function("generate");
    mdp << "BEGIN Generating ordinary propagator\n";
 
    for(b=0; b<psi.nspin; b++)
      for(j=0; j<psi.nc; j++) {

        mdp << "Source: spin=" << b << ", color=" << j << '\n';

        forallsitesandcopies(x)
          for(a=0; a<psi.nspin; a++)
            for(i=0; i<psi.nc; i++) {
              if((x.is_equal(0)) && (a==b) && (i==j)) psi(x,a,i)=1;
              else                                    psi(x,a,i)=0;
            }
        /*
          If a smearing function is passed (smf)
          the source is smeared before the inversion
          the sink must be smeared using smear_sink.
        */
        if(smf!=0) (*smf)(psi,U,smear_coeff);
        stats=mul_invQ(chi,psi,U,coeff,
                       absolute_precision,relative_precision,max_steps);

        forallsites(x)
          for(a=0; a<psi.nspin; a++)
            for(i=0; i<psi.nc; i++) {
              S(x,a,b,i,j)=chi(x,a,i);
          }
        cout << "Statistics: residue=" << stats.residue
             << ", steps=" << stats.steps 
             << ", time=" << stats.time << '\n';          
      }
    mdp << "END Generating ordinary propagator. ";
    mdp << "time=" << mpi.time()-time << '\n';
    end_function("generate");
  }
};

// //////////////////////////////////////////////////////////////////////
// function to print a propagator by components. It prompts for a site //
// similar to the CANOPY one. I used this to test the converter        //

void print_propagator(fermi_propagator &S) {
  begin_function("print_propagator");
  int x0,x1,x2,x3;
  site x(S.lattice());
  int spin_source, spin_sink;
  int color_source, color_sink;
  mdp_complex tmp;
  int do_exit=false;
  int nc=S.nc;
  do {
    mdp << "\nCheck point!\n";
    mdp << "Here you called the function to print the propagator\n";
    mdp << "Enter the coordinates (x0,x1,x2,x3 or 'quit' to end): ";
    if(ME==0) {
      string stringa;
      cin >> stringa;
      if(stringa=="quit") do_exit=true;
      else sscanf(stringa.c_str(),"%i,%i,%i,%i", &x0,&x1,&x2,&x3);
    }
    mpi.broadcast(do_exit,0);
    if(do_exit==true) {
      mdp << '\n';
      break;
    };
    mpi.broadcast(x0,0);
    mpi.broadcast(x1,0);
    mpi.broadcast(x2,0);
    mpi.broadcast(x3,0);
    if(on_which_process(S.lattice(),x0,x1,x2,x3)==ME) {
      x.set(x0,x1,x2,x3);
      for(color_source=0; color_source<nc; color_source++)
        for(spin_source=0; spin_source<4; spin_source++) {
          mdp << "Source: spin=" << spin_source 
              << ", color=" << color_source << '\n';
          for(spin_sink=0; spin_sink<4; spin_sink++) {
            mdp << "[ ";
            for(color_sink=0; color_sink<nc; color_sink++) {
              tmp=S(x,spin_sink, spin_source, color_sink, color_source);
              mdp << tmp;
              if(color_sink<nc-1) mdp << ",\t";
            };
            mdp << " ]\n";
          };
        }; 
      fflush(stdout); 
    };
  } while(1);
  begin_function("print_propagator");
};

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