Actual source code: ex17.c

slepc-3.20.1 2023-11-27
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  1: /*
  2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  4:    Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

  6:    This file is part of SLEPc.
  7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
  8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  9: */

 11: static char help[] = "Solves a polynomial eigenproblem P(l)x = 0 with matrices loaded from a file.\n\n"
 12:   "The command line options are:\n"
 13:   "-A <filename1,filename2, ...> , where <filename1,.. > = matrices A0 ... files in PETSc binary form.\n\n";

 15: #include <slepcpep.h>

 17: #define MAX_MATRICES 40

 19: int main(int argc,char **argv)
 20: {
 21:   Mat            A[MAX_MATRICES]; /* problem matrices */
 22:   PEP            pep;             /* polynomial eigenproblem solver context */
 23:   PetscReal      tol;
 24:   PetscInt       nev,maxit,its,nmat=MAX_MATRICES,i;
 25:   char*          filenames[MAX_MATRICES];
 26:   PetscViewer    viewer;
 27:   PetscBool      flg,terse;

 29:   PetscFunctionBeginUser;
 30:   PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));

 32:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 33:         Load the matrices that define the polynomial eigenproblem
 34:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 36:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nPolynomial eigenproblem stored in file.\n\n"));
 37: #if defined(PETSC_USE_COMPLEX)
 38:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Reading COMPLEX matrices from binary files...\n"));
 39: #else
 40:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Reading REAL matrices from binary files...\n"));
 41: #endif
 42:   PetscCall(PetscOptionsGetStringArray(NULL,NULL,"-A",filenames,&nmat,&flg));
 43:   PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"Must indicate a comma-separated list of file names with the -A option");
 44:   for (i=0;i<nmat;i++) {
 45:     PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filenames[i],FILE_MODE_READ,&viewer));
 46:     PetscCall(MatCreate(PETSC_COMM_WORLD,&A[i]));
 47:     PetscCall(MatSetFromOptions(A[i]));
 48:     PetscCall(MatLoad(A[i],viewer));
 49:     PetscCall(PetscViewerDestroy(&viewer));
 50:   }
 51:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 52:                 Create the eigensolver and set various options
 53:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 55:   /*
 56:      Create eigensolver context
 57:   */
 58:   PetscCall(PEPCreate(PETSC_COMM_WORLD,&pep));

 60:   /*
 61:      Set matrices
 62:   */
 63:   PetscCall(PEPSetOperators(pep,nmat,A));
 64:   /*
 65:      Set solver parameters at runtime
 66:   */
 67:   PetscCall(PEPSetFromOptions(pep));

 69:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 70:                       Solve the eigensystem
 71:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 73:   PetscCall(PEPSolve(pep));
 74:   PetscCall(PEPGetIterationNumber(pep,&its));
 75:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Number of iterations of the method: %" PetscInt_FMT "\n",its));

 77:   /*
 78:      Optional: Get some information from the solver and display it
 79:   */
 80:   PetscCall(PEPGetDimensions(pep,&nev,NULL,NULL));
 81:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Number of requested eigenvalues: %" PetscInt_FMT "\n",nev));
 82:   PetscCall(PEPGetTolerances(pep,&tol,&maxit));
 83:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Stopping condition: tol=%.4g, maxit=%" PetscInt_FMT "\n",(double)tol,maxit));

 85:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 86:                     Display solution and clean up
 87:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 89:   /* show detailed info unless -terse option is given by user */
 90:   PetscCall(PetscOptionsHasName(NULL,NULL,"-terse",&terse));
 91:   if (terse) PetscCall(PEPErrorView(pep,PEP_ERROR_BACKWARD,NULL));
 92:   else {
 93:     PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL));
 94:     PetscCall(PEPConvergedReasonView(pep,PETSC_VIEWER_STDOUT_WORLD));
 95:     PetscCall(PEPErrorView(pep,PEP_ERROR_BACKWARD,PETSC_VIEWER_STDOUT_WORLD));
 96:     PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
 97:   }
 98:   PetscCall(PEPDestroy(&pep));
 99:   for (i=0;i<nmat;i++) {
100:     PetscCall(MatDestroy(&A[i]));
101:     PetscCall(PetscFree(filenames[i]));
102:   }
103:   PetscCall(SlepcFinalize());
104:   return 0;
105: }

107: /*TEST

109:    test:
110:       suffix: 1
111:       args: -A ${SLEPC_DIR}/share/slepc/datafiles/matrices/speaker107k.petsc,${SLEPC_DIR}/share/slepc/datafiles/matrices/speaker107c.petsc,${SLEPC_DIR}/share/slepc/datafiles/matrices/speaker107m.petsc -pep_type {{toar qarnoldi linear}} -pep_nev 4 -pep_ncv 20 -pep_scale scalar -terse
112:       requires: double !complex !defined(PETSC_USE_64BIT_INDICES)

114: TEST*/