142 lines
6.0 KiB
C++
142 lines
6.0 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 ? 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: 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 iKmin" << endl << "int iKmax \t\t Min and max momentum integers to scan over: recommended values: 0 and N" << 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 iKmin = atoi(argv[5]);
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//int iKmax = atoi(argv[6]);
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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, 0, 1);
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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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// The argument given is the name of the standard args_Heis_DSF arguments file
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/*
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if (argc == 2) { // Used an input file to provide the arguments
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if (strcmp(argv[1],"help") == 0) { // Output some instructions
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cout << "Usage of Heis_DSF executable: " << endl;
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cout << endl << "Provide arguments by either using one of the three following options:" << endl << endl;
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cout << "1) via an argument file (see the template `args_Heis_DSF' in directory src/EXECS/), for example" << endl << endl;
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cout << "Heis_DSF args_Heis_DSF" << endl << endl;
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cout << "2) with arguments (for general momenta scan) whichDSF Delta N M iKmin iKmax Max_Secs refine, for example" << endl << endl;
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cout << "Heis_DSF z 0.9 100 40 0 50 600 0" << endl << endl;
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cout << "3) with arguments (for general momenta scan) whichDSF Delta N M iKneeded Max_Secs refine, for example" << endl << endl;
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cout << "Heis_DSF z 0.9 100 40 20 600 0" << endl << endl;
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}
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else { // read argument file
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ifstream argsfile;
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argsfile.open(argv[1]);
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if (argsfile.fail()) {
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cout << argv[1] << endl;
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ABACUSerror("Could not open arguments file.");
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}
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char junk[256];
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while (argsfile.peek() == '#' || argsfile.peek() == '\t' || argsfile.peek() == ' ' || argsfile.peek() == '\n') argsfile.getline(junk, 256);
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char whichDSF; argsfile >> whichDSF;
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while (argsfile.peek() == '#' || argsfile.peek() == '\t' || argsfile.peek() == ' ' || argsfile.peek() == '\n') argsfile.getline(junk, 256);
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DP Delta; argsfile >> Delta;
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while (argsfile.peek() == '#' || argsfile.peek() == '\t' || argsfile.peek() == ' ' || argsfile.peek() == '\n') argsfile.getline(junk, 256);
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int N; argsfile >> N;
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while (argsfile.peek() == '#' || argsfile.peek() == '\t' || argsfile.peek() == ' ' || argsfile.peek() == '\n') argsfile.getline(junk, 256);
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int M; argsfile >> M;
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while (argsfile.peek() == '#' || argsfile.peek() == '\t' || argsfile.peek() == ' ' || argsfile.peek() == '\n') argsfile.getline(junk, 256);
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//bool fixed_iK; argsfile >> fixed_iK;
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//while (argsfile.peek() == '#' || argsfile.peek() == '\t' || argsfile.peek() == ' ' || argsfile.peek() == '\n') argsfile.getline(junk, 256);
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//int iKneeded; argsfile >> iKneeded;
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int iKmin, iKmax; argsfile >> iKmin >> iKmax;
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while (argsfile.peek() == '#' || argsfile.peek() == '\t' || argsfile.peek() == ' ' || argsfile.peek() == '\n') argsfile.getline(junk, 256);
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int Max_Secs; argsfile >> Max_Secs;
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while (argsfile.peek() == '#' || argsfile.peek() == '\t' || argsfile.peek() == ' ' || argsfile.peek() == '\n') argsfile.getline(junk, 256);
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bool refine; argsfile >> refine;
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Scan_Heis (whichDSF, Delta, N, M, iKmin, iKmax, Max_Secs, refine);
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}
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} // if (argc == 2)
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else if (argc == 8) { // fixed_iK
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char whichDSF = *argv[1];
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DP Delta = atof(argv[2]);
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int N = atoi(argv[3]);
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int M = atoi(argv[4]);
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int iKneeded = atoi(argv[5]);
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int Max_Secs = atoi(argv[6]);
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bool refine = (atoi(argv[7]) == 1);
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//Scan_Heis (whichDSF, Delta, N, M, iKneeded, Max_Secs, refine);
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Scan_Heis (whichDSF, Delta, N, M, iKneeded, iKneeded, Max_Secs, refine);
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}
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else if (argc == 9) { // !fixed_iK
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char whichDSF = *argv[1];
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DP Delta = atof(argv[2]);
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int N = atoi(argv[3]);
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int M = atoi(argv[4]);
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int iKmin = atoi(argv[5]);
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int iKmax = atoi(argv[6]);
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int Max_Secs = atoi(argv[7]);
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bool refine = (atoi(argv[8]) == 1);
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//Scan_Heis (whichDSF, Delta, N, M, iKneeded, Max_Secs, refine);
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Scan_Heis (whichDSF, Delta, N, M, iKmin, iKmax, Max_Secs, refine);
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}
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else ABACUSerror("Wrong number of arguments to Heis_DSF executable.");
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*/
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return(0);
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}
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