[petsc-users] newbie questions on preconditioner LU

[Ling Zou]

Jed, thank you so much.

Ling

On Mon, Jan 28, 2013 at 1:05 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

>
> 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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