[petsc-users] elimination of trivial entries in a matrix

[Dominik Szczerba]

That sounds really great, but I do not seem to find any examples how
to use it. I would be grateful for a few more pointers.

Regards,
Dominik

On Tue, Oct 11, 2011 at 4:31 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>  Dominik,
>
>      This is handled by PCREDISTRIBUTE
>
>   Barry
>
> On Oct 11, 2011, at 9:06 AM, Dominik Szczerba wrote:
>
>> My matrix has many trivial entries (A_{ii}=1, A_{i!=j}=0, b_i = b0)
>> that I want to eliminate to reduce the solving time, re-inserting them
>> at the end into the solution vector.
>> Of course I can do it all by creating a second matrix and doing
>> related book-keeping on my own, but was wondering if there is some
>> functionality in Petsc to facilitate it.
>> If so, I would be grateful for just a list of relevant functions to look at.
>>
>> Many thanks
>> Dominik
>
>