Function eigenAnalysis

SRC/tcl/commands.cpp:5662–5865

*/

int 
eigenAnalysis(ClientData clientData, Tcl_Interp *interp, int argc, 
	      TCL_Char **argv)
{
  // make sure at least one other argument to contain type of system
  if (argc < 2) {
    opserr << "WARNING want - eigen <type> numModes?\n";
    return TCL_ERROR;
  }    
  
  bool generalizedAlgo = true; // 0 - frequency/generalized (default),1 - standard, 2 - buckling
  int typeSolver = EigenSOE_TAGS_ArpackSOE;
  int loc = 1;
  double shift = 0.0;
  bool findSmallest = true;
  
  // Check type of eigenvalue analysis
  while (loc < (argc-1)) {
    if ((strcmp(argv[loc],"frequency") == 0) || 
	(strcmp(argv[loc],"-frequency") == 0) ||
	(strcmp(argv[loc],"generalized") == 0) ||
	(strcmp(argv[loc],"-generalized") == 0))
      generalizedAlgo = true;
    
    else if ((strcmp(argv[loc],"standard") == 0) || 
	     (strcmp(argv[loc],"-standard") == 0))
      generalizedAlgo = false;

    else if ((strcmp(argv[loc],"-findLargest") == 0))
      findSmallest = false;
    
    else if ((strcmp(argv[loc],"genBandArpack") == 0) || 
         (strcmp(argv[loc],"-genBandArpack") == 0) ||
         (strcmp(argv[loc],"genBandArpackEigen") == 0) || 
         (strcmp(argv[loc],"-genBandArpackEigen") == 0))
      typeSolver = EigenSOE_TAGS_ArpackSOE;
    
    else if ((strcmp(argv[loc],"symmBandLapack") == 0) || 
         (strcmp(argv[loc],"-symmBandLapack") == 0) ||
         (strcmp(argv[loc],"symmBandLapackEigen") == 0) || 
         (strcmp(argv[loc],"-symmBandLapackEigen") == 0))
      typeSolver = EigenSOE_TAGS_SymBandEigenSOE;
    
    else if ((strcmp(argv[loc],"fullGenLapack") == 0) || 
         (strcmp(argv[loc],"-fullGenLapack") == 0) ||
         (strcmp(argv[loc],"fullGenLapackEigen") == 0) || 
         (strcmp(argv[loc],"-fullGenLapackEigen") == 0))
      typeSolver = EigenSOE_TAGS_FullGenEigenSOE;
    
    else {
      opserr << "eigen - unknown option specified " << argv[loc] << endln;
    }
    
    loc++;
  }
  
    // check argv[loc] for number of modes
  //    int numEigen;