ABACUS/src/EXECS/LiebLin_DSF_tester.cc

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

This software is part of J.-S. Caux's ABACUS library.

Copyright (c) J.-S. Caux.

-----------------------------------------------------------

File:  LiebLin_DSF_tester.cc

Purpose:  allows for Ix2 manipulations (user-prompted) for LiebLin gas

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

#include "ABACUS.h"

using namespace std;
using namespace ABACUS;


int main(int argc, char* argv[])
{

  if (argc != 6) { // provide some info

    cout << endl << "Welcome to ABACUS\t(copyright J.-S. Caux)." << endl;
    cout << endl << "Usage of LiebLin_DSF_tester executable: " << endl;
    cout << endl << "Provide the following arguments:" << endl << endl;
    cout << "char whichDSF \t\t Which structure factor should be calculated ?  Options are:  "
      "d for rho rho, g for psi psi{dagger}, o for psi{dagger} psi" << endl;
    cout << "DP c_int \t\t Value of the interaction parameter:  use positive real values only" << endl;
    cout << "DP L \t\t\t Length of the system:  use positive real values only" << endl;
    cout << "int N \t\t\t Number of particles:  use positive integer values only" << endl;
    cout << "DP kBT \t\t Temperature (positive only of course)" << endl;
    cout << endl << "EXAMPLE: " << endl << endl;
    cout << "LiebLin_DSF_tester d 1.0 100.0 100 0.56 " << endl << endl;
  }

  else { // (argc == 6), correct nr of arguments
    char whichDSF = *argv[1];
    DP c_int = atof(argv[2]);
    DP L = atof(argv[3]);
    int N = atoi(argv[4]);
    DP kBT = atof(argv[5]);

    // Construct the finite-size saddle-point state:
    LiebLin_Bethe_State spstate = Canonical_Saddle_Point_State (c_int, L, N, kBT);
    spstate.Compute_All(true);

    LiebLin_Bethe_State estate = spstate;
    if (whichDSF == 'o') estate = Remove_Particle_at_Center (spstate);
    else if (whichDSF == 'g') estate = Add_Particle_at_Center (spstate);
    if (whichDSF != 'd') estate.Compute_All(true);
    cout << estate << endl;
    Vect<int> OriginIx2 = estate.Ix2;

    int Ix2old, Ix2new;
    int again = 0;
    string label_req;
    do {
      //cout << "Substitute Ix2:  which for which ?" << endl;
      //cin >> Ix2old >> Ix2new;
      //for (int i = 0; i < estate.N; ++i) if (estate.Ix2[i] == Ix2old) estate.Ix2[i] = Ix2new;
      //estate.Ix2.QuickSort();
      cout << "Which label should the exc state be set to?" << endl;
      cin >> label_req;
      estate.Set_to_Label(label_req, OriginIx2);
      estate.Compute_All(false);
      cout << spstate << endl;
      cout << estate;
      if (whichDSF == 'd')
	cout << setprecision(16) << "estate.E - spstate.E = " << estate.E - spstate.E
	     << "\tME = " << real(exp(ln_Density_ME(spstate, estate))) << endl;
      else if (whichDSF == 'o')
	cout << setprecision(16) << "estate.E - spstate.E = " << estate.E - spstate.E
	     << "\tME = " << real(exp(ln_Psi_ME(estate, spstate))) << endl;
      else if (whichDSF == 'g')
	cout << setprecision(16) << "estate.E - spstate.E = " << estate.E - spstate.E
	     << "\tME = " << real(exp(ln_Psi_ME(spstate, estate))) << endl;

      cout << "Another try ? (1 == yes, 0 == no)" << endl;
      again = 1;
      cin >> again;
    } while (again != 0);

  }

  return(0);
}