60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/**********************************************************
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This software is part of J.-S. Caux's ABACUS library.
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Copyright (c) J.-S. Caux
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-----------------------------------------------------------
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File: Heis_DSF.cc
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Purpose: main function for ABACUS for Heisenberg spin-1/2 chain
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***********************************************************/
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#include "ABACUS.h"
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using namespace std;
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using namespace ABACUS;
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int main(int argc, char* argv[])
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{
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if (argc != 8) { // provide some info
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cout << endl << "Welcome to ABACUS\t(copyright J.-S. Caux)." << endl;
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cout << endl << "Usage of Heis_DSF executable: " << endl;
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cout << endl << "Provide the following arguments:" << endl << endl;
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cout << "char whichDSF \t\t Which structure factor should be calculated ? "
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"Options are: m for S- S+, z for Sz Sz, p for S+ S-." << endl;
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cout << "DP Delta \t\t Value of the anisotropy: use positive real values only" << endl;
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cout << "int N \t\t\t Length (number of sites) of the system: "
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"use positive even integer values only" << endl;
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cout << "int M \t\t\t Number of down spins: use positive integer values between 1 and N/2" << endl;
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cout << "int Max_Secs \t\t Allowed computational time: (in seconds)" << endl;
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cout << "DP target_sumrule \t sumrule saturation you're satisfied with" << endl;
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cout << "bool refine \t\t Is this a refinement of a earlier calculations ? (0 == false, 1 == true)" << endl;
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cout << endl << "EXAMPLE: " << endl << endl;
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cout << "Heis_DSF z 1.0 100 40 0 100 600 1.0 0" << endl << endl;
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}
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else if (argc == 8) { // !fixed_iK
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int ctr = 1;
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char whichDSF = *argv[ctr++];
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DP Delta = atof(argv[ctr++]);
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int N = atoi(argv[ctr++]);
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int M = atoi(argv[ctr++]);
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int Max_Secs = atoi(argv[ctr++]);
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DP target_sumrule = atof(argv[ctr++]);
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bool refine = (atoi(argv[ctr++]) == 1);
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// We systematically scan over all momentum integers (to avoid problems with Brillouin folding
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int iKmin = -1000*N;
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int iKmax = 1000*N;
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Scan_Heis (whichDSF, Delta, N, M, iKmin, iKmax, Max_Secs, target_sumrule, refine);
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}
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return(0);
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}
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