[petsc-users] MatGetLocalToGlobalMapping returning null pointers

[Jed Brown]

"Klinvex, Alicia Marie" <amklinv at sandia.gov> writes:
>  ISLocalToGlobalMapping PETScRowOwnership, PETScColOwnership;
>
>   ierr = MatGetLocalToGlobalMapping(A, &PETScRowOwnership, &PETScColOwnership); CHKERRV(ierr);

It appears that the local-to-global mapping has not been set.  Note that
these mappings do not signify "ownership", but rather a map from an
(overlapping) local index space to the non-overlapping global index
space.

Perhaps you would like MatGetOwnershipRange(s)?
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