[petsc-dev] coarse grid in gamg (for the OPTE paper)

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:

>    It is essentially 3 Laplacians so I think the default null space of
>    3 constant vectors is fine. The problem is without the block
>    information presumably GAMG is using only a single constant vector
>    over all variables?  So maybe we need to construct a 3 vector null
>    space which just marks in the reduced vector from which of the 3
>    components each entry came from.

Yup, that's what I would try.
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