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- /**********************************************************
-
- This software is part of J.-S. Caux's ABACUS library.
-
- Copyright (c) J.-S. Caux.
-
- -----------------------------------------------------------
-
- File: Heis_DSF_GeneralState.cc
-
- Purpose: main function for ABACUS for Heisenberg spin-1/2 chain
-
- ***********************************************************/
-
- #include "ABACUS.h"
-
- using namespace std;
- using namespace ABACUS;
-
-
- int main(int argc, char* argv[])
- {
-
- if (argc != 9) { // provide some info
-
- cout << endl << "Welcome to ABACUS\t(copyright J.-S. Caux)." << endl;
- cout << endl << "Usage of Heis_DSF executable: " << endl;
- cout << endl << "Provide the following arguments:" << endl << endl;
- cout << "char whichDSF \t\t Which structure factor should be calculated ? Options are: m for S- S+, z for Sz Sz, p for S+ S-." << endl;
- cout << "DP Delta \t\t Value of the anisotropy: use positive real values only" << endl;
- cout << "int N \t\t\t Length (number of sites) of the system: use positive even integer values only" << endl;
- cout << "int M \t\t\t Number of down spins: use positive integer values between 1 and N/2" << 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: 0 and 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 a earlier calculations ? (0 == false, 1 == true)" << endl;
- cout << endl << "EXAMPLE: " << endl << endl;
- }
-
- else if (argc == 9) { // !fixed_iK
- int ctr = 1;
- char whichDSF = *argv[ctr++];
- DP Delta = atof(argv[ctr++]);
- int N = atoi(argv[ctr++]);
- int M = atoi(argv[ctr++]);
- char* Ix2filenameprefix = argv[ctr++];
- //int iKmin = atoi(argv[5]);
- //int iKmax = atoi(argv[6]);
- int Max_Secs = atoi(argv[ctr++]);
- DP target_sumrule = atof(argv[ctr++]);
- bool refine = (atoi(argv[ctr++]) == 1);
-
- // We systematically scan over all momentum integers (to avoid problems with Brillouin folding
- int iKmin = -1000*N;
- int iKmax = 1000*N;
-
- // Read the Ix2 from the file:
- // Format is:
- // base_level, Nrap[base_level], \endl Ix2[base_level], repeat for all occupied base_levels...
- 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 Heis_DSF_GeneralState");
- }
-
- Heis_Chain chain(1.0, Delta, 0.0, N);
-
- Vect<int> Nrap_read (0, chain.Nstrings);
- int level = 0;
- Vect<Vect<int> > Ix2_read (chain.Nstrings);
- do {
- Ix2_input_file >> level;
- Ix2_input_file >> Nrap_read[level];
- Ix2_read[level] = Vect<int> (Nrap_read[level]);
- for (int alpha = 0; alpha < Nrap_read[level]; ++alpha) Ix2_input_file >> Ix2_read[level][alpha];
- //cout << "Read level = " << level << "\tNrap_read[level] = " << Nrap_read[level] << endl;
- //cout << "\tIx2_read[level] = " << Ix2_read[level] << endl;
- } while (Ix2_input_file.peek() != EOF);
-
- // Construct the Averaging State:
- Heis_Base base (chain, Nrap_read);
-
- int paralevel = 0;
- Vect<int> rank; // dummy
- Vect<int> nr_processors; // dummy
-
- if (Delta > 0.0 && Delta < 1.0) {
- XXZ_Bethe_State AveragingState (chain, base);
- for (int il = 0; il < chain.Nstrings; ++il) {
- if (Nrap_read[il] > 0) for (int alpha = 0; alpha < Nrap_read[il]; ++alpha) AveragingState.Ix2[il][alpha] = Ix2_read[il][alpha];
- }
- AveragingState.Set_Label_from_Ix2(AveragingState.Ix2);
- AveragingState.Compute_All(true);
-
- //cout << "AveragingState read from file: " << AveragingState << endl;
- // Perform the scan:
- Scan_Heis (whichDSF, AveragingState, defaultScanStatename, iKmin, iKmax, Max_Secs, target_sumrule, refine, paralevel, rank, nr_processors);
- }
- else if (Delta == 1.0) {
- XXX_Bethe_State AveragingState (chain, base);
- for (int il = 0; il < chain.Nstrings; ++il) {
- for (int alpha = 0; alpha < Nrap_read[il]; ++alpha) AveragingState.Ix2[il][alpha] = Ix2_read[il][alpha];
- }
- AveragingState.Set_Label_from_Ix2(AveragingState.Ix2);
- AveragingState.Compute_All(true);
-
- // Perform the scan:
- Scan_Heis (whichDSF, AveragingState, defaultScanStatename, iKmin, iKmax, Max_Secs, target_sumrule, refine, paralevel, rank, nr_processors);
- }
- else if (Delta > 1.0) {
- XXZ_gpd_Bethe_State AveragingState (chain, base);
- for (int il = 0; il < chain.Nstrings; ++il) {
- for (int alpha = 0; alpha < Nrap_read[il]; ++alpha) AveragingState.Ix2[il][alpha] = Ix2_read[il][alpha];
- }
- AveragingState.Set_Label_from_Ix2(AveragingState.Ix2);
- AveragingState.Compute_All(true);
-
- // Perform the scan:
- Scan_Heis (whichDSF, AveragingState, defaultScanStatename, iKmin, iKmax, Max_Secs, target_sumrule, refine, paralevel, rank, nr_processors);
- }
- }
-
- return(0);
- }
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