Actual source code: test18.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[] = "Symmetric-indefinite eigenproblem.\n\n"
 12:   "The command line options are:\n"
 13:   "  -n <n>, where <n> = number of grid subdivisions in x dimension.\n\n";

 15: #include <slepceps.h>

 17: int main(int argc,char **argv)
 18: {
 19:   Mat            A,B;             /* problem matrices */
 20:   EPS            eps;             /* eigenproblem solver context */
 21:   PetscInt       N,n=10,Istart,Iend,II,nev,i,j;
 22:   PetscBool      terse;

 25:   SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 26:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 27:   N = n*n;
 28:   PetscPrintf(PETSC_COMM_WORLD,"\nSymmetric-indefinite eigenproblem, N=%D\n\n",N);

 30:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 31:           Compute the matrices that define the eigensystem, Ax=kBx
 32:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 34:   MatCreate(PETSC_COMM_WORLD,&A);
 35:   MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N);
 36:   MatSetFromOptions(A);
 37:   MatSetUp(A);

 39:   MatCreate(PETSC_COMM_WORLD,&B);
 40:   MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,N,N);
 41:   MatSetFromOptions(B);
 42:   MatSetUp(B);

 44:   MatGetOwnershipRange(A,&Istart,&Iend);
 45:   for (II=Istart;II<Iend;II++) {
 46:     i = II/n; j = II-i*n;
 47:     if (i>0) { MatSetValue(A,II,II-n,-1.0,INSERT_VALUES); }
 48:     if (i<n-1) { MatSetValue(A,II,II+n,-1.0,INSERT_VALUES); }
 49:     if (j>0) { MatSetValue(A,II,II-1,-1.0,INSERT_VALUES); }
 50:     if (j<n-1) { MatSetValue(A,II,II+1,-1.0,INSERT_VALUES); }
 51:     MatSetValue(A,II,II,4.0,INSERT_VALUES);
 52:     MatSetValue(B,II,N-II-1,1.0,INSERT_VALUES);
 53:   }

 55:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 56:   MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);
 57:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
 58:   MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);

 60:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 61:                 Create the eigensolver and set various options
 62:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 64:   EPSCreate(PETSC_COMM_WORLD,&eps);
 65:   EPSSetOperators(eps,A,B);
 66:   EPSSetProblemType(eps,EPS_GHIEP);
 67:   EPSSetFromOptions(eps);

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

 73:   EPSSolve(eps);
 74:   EPSGetDimensions(eps,&nev,NULL,NULL);
 75:   PetscPrintf(PETSC_COMM_WORLD," Number of requested eigenvalues: %D\n",nev);

 77:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 78:                     Display solution and clean up
 79:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 81:   /* show detailed info unless -terse option is given by user */
 82:   PetscOptionsHasName(NULL,NULL,"-terse",&terse);
 83:   if (terse) {
 84:     EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);
 85:   } else {
 86:     PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL);
 87:     EPSReasonView(eps,PETSC_VIEWER_STDOUT_WORLD);
 88:     EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD);
 89:     PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);
 90:   }

 92:   EPSDestroy(&eps);
 93:   MatDestroy(&A);
 94:   MatDestroy(&B);
 95:   SlepcFinalize();
 96:   return ierr;
 97: }

 99: /*TEST

101:    testset:
102:       args: -eps_nev 4 -eps_ncv 12 -terse -st_type sinvert -eps_krylovschur_restart .3
103:       output_file: output/test18_1.out
104:       test:
105:          suffix: 1_ks
106:          requires: !single
107:       test:
108:          suffix: 1_ks_gnhep
109:          args: -eps_gen_non_hermitian
110:          requires: !single
111:       test:
112:          suffix: 2_cuda_ks
113:          args: -mat_type aijcusparse
114:          requires: cuda !single
115:       test:
116:          suffix: 2_cuda_ks_gnhep
117:          args: -eps_gen_non_hermitian -mat_type aijcusparse
118:          requires: cuda !single

120:    test:
121:       suffix: 1_davidson
122:       args: -eps_type {{gd jd}} -eps_target 0 -eps_harmonic -eps_nev 4 -eps_ncv 12 -terse
123:       requires: !single !complex
124:       output_file: output/test18_1.out
125: TEST*/