[petsc-users] pcfieldsplitting not working for VI

[Justin Chang]

Lawrence,

I added the following line:

rs_solver.setDM(a._dm)

And it gives this error:

Traceback (most recent call last):
  File "sphere.py", line 128, in <module>
    rs_solver.setDM(a._dm)
AttributeError: 'Form' object has no attribute '_dm'

Thanks,
Justin

On Tue, Nov 29, 2016 at 1:12 AM, Lawrence Mitchell <
lawrence.mitchell at imperial.ac.uk> wrote:

>
>
> > On 29 Nov 2016, at 02:02, Justin Chang <jychang48 at gmail.com> wrote:
> >
> > Why is this happening? It seems to me VINEWTONRSLS is not understanding
> that I have a two-field formulation.
>
> For the built in solvers, we set up a dmshell on the snes that knows how
> to do field splitting.  Because you set your snes up by hand, it isn't
> available. You'll need to call snes.setDM. The mixed finctionspace provides
> the correct dm via a ._dm property I think.
>
> Lawrence
>
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