[petsc-dev] Strange array indexing in MatDestroySubMatrices

[Hong]

MatCreateSubMatrices_xxx() calloc an array of size n+1, n=ismax and
submat[n]=null as default.

For MatCreateSubMatrices_MPIAIJ(), I calloc ismax+nstages and use
submat[n] ... to store some datastructures for reuse.

When submat[n] != null, these data structures are destroyed.

Hong

On Wed, Jul 12, 2017 at 11:29 AM, Stefano Zampini <stefano.zampini at gmail.com
> wrote:

> Is line number 6890 of matrix.c correct???
>
> https://bitbucket.org/petsc/petsc/src/b02a13eda23b9fabea7dbfcadcfb98
> e3258ee49d/src/mat/interface/matrix.c?at=master&fileviewer=
> file-view-default#matrix.c-6890
>
> --
> Stefano
>
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