[petsc-users] newbie questions on preconditioner LU

[Jed Brown]

On Mon, Jan 28, 2013 at 1:35 PM, Matthew Knepley <knepley at gmail.com> wrote:

> Jed, I don't think that was the question. He was asking, does LU always
> use A as the matrix to factorize, or can I use M? to which the
> answer is plainly Yes.
>

Okay, but when using KSPSetOperators(ksp,A,M,...), the preconditioner is
*not* M^{-1} (unless you use LU).
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