[petsc-users] Problem setting Fieldsplit fields

[Nicolas Barnafi]

Hi Matt,

Sorry for the late answer, it was holiday time.

> Just to clarify, if you call SetIS() 3 times, and then give
>
>   -pc_fieldsplit_0_fields 0,2
>
> then we should reduce the number of fields to two by calling 
> ISConcatenate() on the first and last ISes?

Exactly

> I think this should not be hard. It will work exactly as it does on 
> the DM case, except the ISes will come from
> the PC, not the DM. One complication is that you will have to hold the 
> new ISes until the end, and then set them.
>
>    Thanks,
>
>      Matt

Nice, then it is exactly what I want. I will work on it, and create a PR 
when things are starting to fit in.

Best,
NB
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20230222/1f0efa58/attachment.html>