As a note, with MatNest and MatZeroRowsColumns I get

[0]PETSC ERROR: No support for this operation for this object type
[0]PETSC ERROR: Mat type nest

which is informative, but with MatNest and and MatZeroRowsColumnsLocal I get

[0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation,
probably memory access out of range


On 4 February 2018 at 18:43, Jed Brown <> wrote:

> It is not implemented and it's somewhat inconsistent with the MatNest
> philosophy of specifying everything in terms of local indices, though it
> could be implemented.
> "Garth N. Wells" <> writes:
> > Should MatZeroRowsColumnsLocal work for matrices of type MATNEST?
> >
> > Garth

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