ABACUS/src/EXECS/LiebLin_DSF_MosesState.cc

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

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

Copyright (c) J.-S. Caux.

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

File:  LiebLin_DSF.cc

Purpose:  main function for ABACUS for LiebLin gas

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

#include "ABACUS.h"

using namespace std;
using namespace ABACUS;


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

  if (argc != 13) { // provide some info

    cout << endl << "Welcome to ABACUS\t(copyright J.-S. Caux)." << endl;
    cout << endl << "Usage of LiebLin_DSF_MosesState 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 << "int Nl \t\t\t Number of particles in left Fermi sea (Nr is then N - Nl)" << endl;
    cout << "int DIl \t\t shift of left  sea as compared to its ground state position" << endl;
    cout << "int DIr \t\t shift of right sea as compared to its ground state position" << endl;
    cout << "int iKmin" << endl << "int iKmax \t\t Min and max momentum integers to scan over:  "
      "recommended values:  -2*N and 2*N" << endl;
    cout << "int Max_Secs \t\t Allowed computational time:  (in seconds)" << endl;
    cout << "DP target_sumrule \t sumrule saturation you're satisfied with" << endl;
    cout << "bool refine \t\t Is this a refinement of earlier calculations ?  (0 == false, 1 == true)" << endl;
    cout << endl << "EXAMPLE: " << endl << endl;
    cout << "LiebLin_DSF_MosesState d 1.0 100.0 100 50 -30 20 0 200 600 1.0 0" << endl << endl;
  }

  else { // (argc == 13), correct nr of arguments
    char whichDSF = *argv[1];
    DP c_int = atof(argv[2]);
    DP L = atof(argv[3]);
    int N = atoi(argv[4]);
    int Nl = atoi(argv[5]);
    int DIl = atoi(argv[6]);
    int DIr = atoi(argv[7]);
    int iKmin = atoi(argv[8]);
    int iKmax = atoi(argv[9]);
    int Max_Secs = atoi(argv[10]);
    DP target_sumrule = atof(argv[11]);
    bool refine = (atoi(argv[12]) == 1);

    // Define the Moses state:
    LiebLin_Bethe_State MosesState (c_int, L, N);

    // Split the sea:
    for (int i = 0; i < Nl; ++i) MosesState.Ix2[i] += 2 * DIl;
    for (int i = Nl; i < N; ++i) MosesState.Ix2[i] += 2 * DIr;

    MosesState.Compute_All (true);

    // Handy default name:
    stringstream defaultScanStatename_strstream;
    defaultScanStatename_strstream << "Moses_Nl_" << Nl << "_DIl_" << DIl << "_DIr_" << DIr;
    string defaultScanStatename = defaultScanStatename_strstream.str();

    // Compute the correlation:
    Scan_LiebLin (whichDSF, MosesState, defaultScanStatename, iKmin, iKmax, Max_Secs, target_sumrule, refine);

  }

  return(0);
}