ABACUS/src/EXECS/LiebLin_DSF_GeneralState.cc

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

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

Copyright (c) J.-S. Caux.

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

File:  LiebLin_DSF_GeneralState.cc

Purpose:  function for ABACUS for LiebLin gas, on general states

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

#include "ABACUS.h"

using namespace std;
using namespace ABACUS;


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

  if (argc != 11) { // provide some info

    cout << endl << "Welcome to ABACUS\t(copyright J.-S. Caux)." << endl;
    cout << endl << "Usage of LiebLin_DSF_Tgt0 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 << "char* defaultScanStatename:\t\t file [].Ix2 contains the quantum numbers defining the "
      "AveragingState; used as defaultScanStatename" << 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 d 1.0 100.0 100 0 200 0.56 600 1.0 0" << endl << endl;
  }

  else { // (argc == 10), correct nr of arguments
    int n = 1;
    char whichDSF = *argv[n++];
    DP c_int = atof(argv[n++]);
    DP L = atof(argv[n++]);
    int N = atoi(argv[n++]);
    char* Ix2filenameprefix = argv[n++];
    int iKmin = atoi(argv[n++]);
    int iKmax = atoi(argv[n++]);
    int Max_Secs = atoi(argv[n++]);
    DP target_sumrule = atof(argv[n++]);
    bool refine = (atoi(argv[n++]) == 1);

    // Read the Ix2 from the file:
    Vect<int> Ix2_input(N);
    ifstream Ix2_input_file;
    stringstream filenamestrstream;
    filenamestrstream << Ix2filenameprefix;
    string defaultScanStatename = filenamestrstream.str();
    filenamestrstream << ".Ix2";
    string filenamestr = filenamestrstream.str();
    const char* filename_Cstr = filenamestr.c_str();
    Ix2_input_file.open(filename_Cstr);
    if (Ix2_input_file.fail()) {
      cout << filename_Cstr << endl;
      ABACUSerror("Could not open Ix2 input file in LiebLin_DSF_GeneralState");
    }
    for (int i = 0; i < N; ++i) {
      Ix2_input_file >> Ix2_input[i];
    }

    // Now define the AveragingState
    LiebLin_Bethe_State AveragingState(c_int, L, N);
    AveragingState.Ix2 = Ix2_input;
    AveragingState.Compute_All(true);

    Scan_LiebLin (whichDSF, AveragingState, defaultScanStatename, iKmin, iKmax, Max_Secs, target_sumrule, refine);

  }

  return(0);
}