Date: 2022-08-09T09:05:51+00:00

Actual source code: ex17.c
slepc-3.17.2 2022-08-09
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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:   SlepcInitialize(&argc,&argv,(char*)0,help);

     31:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     32:         Load the matrices that define the polynomial eigenproblem
     33:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

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

     54:   /*
     55:      Create eigensolver context
     56:   */
     57:   PEPCreate(PETSC_COMM_WORLD,&pep);

     59:   /*
     60:      Set matrices
     61:   */
     62:   PEPSetOperators(pep,nmat,A);
     63:   /*
     64:      Set solver parameters at runtime
     65:   */
     66:   PEPSetFromOptions(pep);

     68:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     69:                       Solve the eigensystem
     70:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

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

     76:   /*
     77:      Optional: Get some information from the solver and display it
     78:   */
     79:   PEPGetDimensions(pep,&nev,NULL,NULL);
     80:   PetscPrintf(PETSC_COMM_WORLD," Number of requested eigenvalues: %" PetscInt_FMT "\n",nev);
     81:   PEPGetTolerances(pep,&tol,&maxit);
     82:   PetscPrintf(PETSC_COMM_WORLD," Stopping condition: tol=%.4g, maxit=%" PetscInt_FMT "\n",(double)tol,maxit);

     84:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     85:                     Display solution and clean up
     86:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

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

    106: /*TEST

    108:    test:
    109:       suffix: 1
    110:       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
    111:       requires: double !complex !defined(PETSC_USE_64BIT_INDICES)

    113: TEST*/