[petsc-users] newbie questions on preconditioner LU

[Jed Brown]

On Mon, Jan 28, 2013 at 2:03 PM, Ling Zou <lingzou80 at gmail.com> wrote:

> So, is it correct to say that, we provide a Pmat matrix, the PC will use
> this Pmat to do the preconditioning operation (with an operation name
> M^{-1}, but it is only operations not really a matrix).
>
> This Pmat can be obtained, for example, from a lower order method of the
> problem (as stated in the manual).
>
> The PC in PETSc provides different options how to get this M^{-1}
> operations from the Pmat provide by the user.
>

yes
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