[petsc-users] SNES and ghosted vector of unknowns

[Jed Brown]

On Mon, Apr 23, 2012 at 08:41, Matthew Knepley <knepley at gmail.com> wrote:

> -snes_mf uses FD to approximate the ACTION of the operator. The above
> quotes are talking about using FD to approximate the operator itself.
>

I.e., to assemble as a sparse matrix, so that it can be used as input to a
preconditioning method.
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