[petsc-users] near null space redundant

[Anton]

On 3/5/15 4:18 PM, Matthew Knepley wrote:
> On Thu, Mar 5, 2015 at 5:01 AM, anton <popov at uni-mainz.de 
> <mailto:popov at uni-mainz.de>> wrote:
>
>     Hi,
>
>     Does the near-null-space get attached to the internal ksp object
>     of redundant preconditioner, or a user has to scatter and attach
>     it manually?
>     If so, what would be a suggested way to do that?
>
>
> Its not there, but would be easy to put in. I would either
>
>   a) Open an issue with the Bitbucket tracker, and someone will get to it
>
> or
>
>   b) Code it up in a pull request
>
> I think it would only be a few lines in PCSetUp_Redundant(). You check 
> whether the pc->mat has
> an attached near null space, and then use the VecScatters above to map 
> the vectors, and carry
> over the flag for constant null space.
>
>   Thanks,
>
>      Matt
Thanks Matt, I'll check this

Anton
>
>     Thanks,
>
>     Anton
>
>
>
>
> -- 
> 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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