Date: 2024-04-26T10:22:00+00:00

Actual source code: test23.c
slepc-3.21.1 2024-04-26
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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[] = "Test EPS view and monitor functionality.\n\n";

     13: #include <slepceps.h>

     15: int main(int argc,char **argv)
     16: {
     17:   Mat            A;
     18:   EPS            eps;
     19:   PetscInt       n=6,Istart,Iend,i;

     21:   PetscFunctionBeginUser;
     22:   PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
     23:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
     24:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nEPS of diagonal problem, n=%" PetscInt_FMT "\n\n",n));

     26:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     27:         Generate the matrix
     28:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     29:   PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
     30:   PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n));
     31:   PetscCall(MatSetFromOptions(A));
     32:   PetscCall(MatGetOwnershipRange(A,&Istart,&Iend));
     33:   for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A,i,i,i+1,INSERT_VALUES));
     34:   PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
     35:   PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));

     37:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     38:                      Create the EPS solver
     39:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     40:   PetscCall(EPSCreate(PETSC_COMM_WORLD,&eps));
     41:   PetscCall(PetscObjectSetName((PetscObject)eps,"eps"));
     42:   PetscCall(EPSSetOperators(eps,A,NULL));
     43:   PetscCall(EPSSetFromOptions(eps));

     45:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     46:                 Solve the eigensystem and display solution
     47:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     48:   PetscCall(EPSSolve(eps));
     49:   PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
     50:   PetscCall(EPSDestroy(&eps));
     51:   PetscCall(MatDestroy(&A));
     52:   PetscCall(SlepcFinalize());
     53:   return 0;
     54: }

     56: /*TEST

     58:    test:
     59:       suffix: 1
     60:       args: -eps_error_backward ::ascii_info_detail -eps_largest_real -eps_balance oneside -eps_view_values -eps_monitor_conv -eps_error_absolute ::ascii_matlab -eps_monitor_all -eps_converged_reason -eps_view
     61:       requires: !single
     62:       filter: grep -v "tolerance" | sed -e "s/hermitian/symmetric/" -e "s/[+-]0\.0*i//g" -e "s/\([1-6]\.\)[+-][0-9]\.[0-9]*e-[0-9]*i/\\1/g" -e "s/[0-9]\.[0-9]*e-\([0-9]*\)/removed/g"

     64:    test:
     65:       suffix: 2
     66:       args: -n 20 -eps_largest_real -eps_monitor -eps_view_values ::ascii_matlab
     67:       requires: double
     68:       filter: sed -e "s/[+-][0-9]\.[0-9]*e-[0-9]*i//" -e "s/[0-9]\.[0-9]*e-\([0-9]*\)/removed/g" -e "s/2\.[0-9]*e+01/2.0000000000000000e+01/" -e "s/1\.9999999999[0-9]*e+01/2.0000000000000000e+01/"

     70:    test:
     71:       suffix: 3
     72:       args: -n 20 -eps_largest_real -eps_monitor draw::draw_lg -eps_monitor_all draw::draw_lg -eps_view_values draw -draw_save myeigen.ppm -draw_virtual
     73:       requires: x double

     75: TEST*/