[petsc-users] IS from MatNestGetISs

[tangqi]

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
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