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

[Jed Brown]

"Kong, Fande" <fande.kong at inl.gov> writes:

> 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's a QR factorization, where the (right triangular) R is optional.
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