From the manual page: "The reference count is not increased on the returned
ISs", so you should not delete them
Note that the rule in PETSc is items obtained with a call that contains the
work Create must destroy the object, if it contains Get then it should not
destroy the object.
Barry
> On Jun 15, 2019, at 9:17 PM, tangqi via petsc-users <petsc-users@mcs.anl.gov>
> wrote:
>
> Dear all,
>
> Do I need to delete index_set from MatNestGetISs? I get my index_set from
> MatNestGetISs(P, index_set, NULL); //P is a nest matrix of 3x3
>
> When I delete index_set later
> for (int i=0; i<3; i++)
> {
> ISDestroy(&index_set[i]);
> }
>
> It gives me error
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Invalid argument
> [0]PETSC ERROR: Wrong type of object: Parameter # 1
> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for
> trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.11.1, Apr, 12, 2019
> [0]PETSC ERROR: Unknown Name on a arch-linux2-c-debug named ba005.localdomain
> by qtang Sat Jun 15 19:48:29 2019
> [0]PETSC ERROR: Configure options
> --with-mpi-dir=/usr/projects/hpcsoft/toss3/badger/openmpi/2.1.2-gcc-7.4.0
> --download-hypre --with-cxx-dialect=C++11
> [0]PETSC ERROR: #1 ISDestroy() line 428 in
> /turquoise/users/qtang/Software/petsc-3.11.1/src/vec/is/is/interface/index.c
>
> Thanks,
> Qi
