"Mark F. Adams" <[email protected]> writes: >> >>> This is a sort of sensible number. >> >> Nonsense! PETSc and C both use 0-based indexing consistently. This is >> not a Fortran interface. > > I meant it is a valid number. An IS can start at 1.
An IS can start at any number, but this one starts at 0 and when ISStrideGetInfo reads 1, it's reading out of IS_General, specifically the PetscBool "sorted" field with 32-bit ints, and combination of PetscBool "sorted" and PetscBool "allocated" with 64-bit ints.
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