[petsc-dev] getting norm type or pc side after resetting ksp type

[Matthew Knepley]

It looks like when we change a KSP type, we need to reset the PC_SIDE and
KSP_NORM back to the defaults. Is
there an argument against this?

   Matt

On Mon, Mar 26, 2012 at 10:02 AM, Lisandro Dalcin <dalcinl at gmail.com> wrote:

> Please look at the following example. The error is really unexpected
> for me, but I'm not sure how to fix it:
>
> In [1]: from petsc4py import PETSc
>
> In [2]: ksp = PETSc.KSP().create()
>
> In [3]: ksp.setType('gmres')
>
> In [4]: ksp.getNormType()
> Out[4]: 1
>
> In [5]: ksp.setType('fgmres') # changing ksp type
>
> In [6]: ksp.getNormType()
> ---------------------------------------------------------------------------
> Error                                     Traceback (most recent call last)
> /Users/dalcinl/Devel/PetIGA/demo/<ipython-input-6-40949252afeb> in
> <module>()
> ----> 1 ksp.getNormType()
>
>
> /Users/dalcinl/Library/Python/2.7/lib/python/site-packages/petsc4py/lib/arch-darwin-c-debug/PETSc.so
> in petsc4py.PETSc.KSP.getNormType (src/petsc4py.PETSc.c:106669)()
>
> Error: error code 56
> [0] KSPGetNormType() line 317 in
> /Users/dalcinl/Devel/petsc-3.2/src/ksp/ksp/interface/itcreate.c
> [0] KSPSetUpNorms_Private() line 284 in
> /Users/dalcinl/Devel/petsc-3.2/src/ksp/ksp/interface/itcreate.c
> [0] No support for this operation for this object type
> [0] KSP fgmres does not support PRECONDITIONED with LEFT
>
>
>
> --
> Lisandro Dalcin
> ---------------
> CIMEC (INTEC/CONICET-UNL)
> Predio CONICET-Santa Fe
> Colectora RN 168 Km 472, Paraje El Pozo
> 3000 Santa Fe, Argentina
> Tel: +54-342-4511594 (ext 1011)
> Tel/Fax: +54-342-4511169
>



-- 
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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