Actual source code: test19.c

slepc-3.11.2 2019-07-30
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  1: /*
  2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  4:    Copyright (c) 2002-2019, 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[] = "Tests the usage of object prefix.\n\n"
 12:   "The command line options are:\n"
 13:   "  -n <n>, where <n> = matrix dimension.\n\n";

 15: #include <slepceps.h>

 17: int main(int argc,char **argv)
 18: {
 19:   Mat            A;           /* problem matrix */
 20:   EPS            eps;         /* eigenproblem solver context */
 21:   PetscInt       n=30,i,Istart,Iend;
 22:   const char     *prefix;

 25:   SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;

 27:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 28:   PetscPrintf(PETSC_COMM_WORLD,"\nDiagonal Eigenproblem, n=%D\n\n",n);

 30:   MatCreate(PETSC_COMM_WORLD,&A);
 31:   MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);
 32:   MatSetFromOptions(A);
 33:   MatSetUp(A);
 34:   MatGetOwnershipRange(A,&Istart,&Iend);
 35:   for (i=Istart;i<Iend;i++) {
 36:     MatSetValue(A,i,i,i+1,INSERT_VALUES);
 37:   }
 38:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 39:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 41:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 42:            Create the eigensolver and mess up with the prefix
 43:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 44:   EPSCreate(PETSC_COMM_WORLD,&eps);
 45:   EPSSetOptionsPrefix(eps,"check_");
 46:   EPSAppendOptionsPrefix(eps,"myprefix_");
 47:   EPSGetOptionsPrefix(eps,&prefix);
 48:   PetscPrintf(PETSC_COMM_WORLD,"EPS prefix is currently: %s\n\n",prefix);

 50:   EPSSetOperators(eps,A,NULL);
 51:   EPSSetProblemType(eps,EPS_HEP);
 52:   EPSSetFromOptions(eps);
 53:   EPSSolve(eps);

 55:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 56:                     Display solution and clean up
 57:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 58:   EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);
 59:   EPSDestroy(&eps);
 60:   MatDestroy(&A);
 61:   SlepcFinalize();
 62:   return ierr;
 63: }

 65: /*TEST

 67:    test:
 68:       suffix: 1
 69:       args: -check_myprefix_eps_nev 2 -check_myprefix_st_type sinvert

 71: TEST*/