[petsc-users] Algorithms to remove null spaces in a singular system

[Matthew Knepley]

On Thu, Oct 13, 2016 at 9:06 AM, Kong, Fande <fande.kong at inl.gov> wrote:

>
>
> On Wed, Oct 12, 2016 at 10:21 PM, Jed Brown <jed at jedbrown.org> wrote:
>
>> Barry Smith <bsmith at mcs.anl.gov> writes:
>> >   I would make that a separate routine that the users would call first.
>>
>> We have VecMDot and VecMAXPY.  I would propose adding
>>
>>   VecQR(PetscInt nvecs,Vec *vecs,PetscScalar *R);
>>
>> (where R can be NULL).
>>
>
> What does R mean here?
>

It means the coefficients of the old basis vectors in the new basis.

  Matt


> If nobody working on this, I will be going to take a try.
>
> Fande,
>
>
>>
>> Does anyone use the "Vecs" type?
>>
>
>


-- 
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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