dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Wed, Apr 14, 2010 at 09:33:20AM -0000, Garth Wells wrote:
> Question #107349 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/107349
>
> Garth Wells proposed the following answer:
>
> On 14/04/10 17:17, Anders Logg wrote:
> > On Wed, Apr 14, 2010 at 07:17:44AM -0000, bluejerry wrote:
> >> New question #107349 on DOLFIN:
> >> https://answers.launchpad.net/dolfin/+question/107349
> >>
> >> Is it possible to receive some sorf of error feedback when a solution did not converge while using the Krylov solver. A warning is printed by the PETsc solver that it did not converge, but I can't seem to find a way to detect this programatically. The solve method returns a Function even if the solver did not converge.
> >>
> >> Thank you
> >>
> >> Renier
> >
> > We had a similar problem with the Newton solver last week. It didn't
> > converge but we thought it did.
> >
> > I would also like to see an error when the solver doesn't converge.
> >
>
> Just an error is bad. Presently, a warning message is printed, but we
> can add a parameter to switch between error/warning.

Sounds good. I think it should be set to error by default with the
possibility to change it to a warning. That is safest for first time
users. Someone with a little more experience would check for
convergence and have a strategy for handling the case where things
don't converge (change of parameters, time step etc).

--
Anders

Attachment: signature.asc
Description: Digital signature