[petsc-dev] Differences between injection and interpolation creation

[Lawrence Mitchell]

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Hi all,

is there a strong reason why DMCreateInjection builds a VecScatter
rather than a Mat (unlike DMCreateInterpolation)?
This seems to rule out creating an injection routine that does coarse
cell averaging (for, e.g. FV problems).  When used in SNESFAS, the
scatter from DMCreateInjection immediately gets wrapped up in a Mat
anyway.

Cheers,

Lawrence
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