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,NULL,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*/