[petsc-users] LU vs. ILU

[Matthew Knepley]

On Thu, Feb 3, 2011 at 10:35 AM, Verena Kuhlemann <vkuhlem at emory.edu> wrote:

> Hello,
>
> I am somehow confused with the usage of PCLU and PCILU ind PETSc.
> It seems as there are the same options to choose from for both.
> In particular, if I use PCLU and PCFactorSetFill(pc,5)
> don't I end up with an incomplete LU factorization?
> If I use PCLU with no other options set, will the
> factorization be complete?
>

LU ignores the fill option. It always gives the complete factorization.

   Matt


> Thanks,
> Verena
>
-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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