dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

On 16/04/10 18:51, Anders Logg wrote:
> Question #107349 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/107349
>
>      Status: Open =>  Answered
>
> Anders Logg proposed the following answer:
> It's a global parameter now valid for both the Krylov and Newton
> solvers, but perhaps it should be a local paramer. Opinions?

It should definitely be possible to set it independently for different 
instances of Krylov solvers and Newton solvers.

Garth

> --
> Anders
>
>
> On Fri, Apr 16, 2010 at 01:33:26PM -0000, bluejerry wrote:
> > Question #107349 on DOLFIN changed:
> > https://answers.launchpad.net/dolfin/+question/107349
> >
> >      Status: Answered =>  Open
> >
> > bluejerry is still having a problem:
> > Thanks that looks better.
> >
> > I assume this is to be set in the 'krylov_solver' submenu? If so it is not
> > in the parameter options (KeyError) in my last bzr pull (today)
> >
> > Unless there is something I am missing.
> >
> > Renier
> >
> > On Thu, Apr 15, 2010 at 9:00 PM, Anders Logg<
> > question107349@xxxxxxxxxxxxxxxxxxxxx>  wrote:
> >
> > > Question #107349 on DOLFIN changed:
> > > https://answers.launchpad.net/dolfin/+question/107349
> > >
> > > Anders Logg proposed the following answer:
> > > On Wed, Apr 14, 2010 at 11:50:36AM +0200, Anders Logg wrote:
> > > > 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).
> > >
> > > Done. The parameter name is "error_on_nonconvergence".
> > >
> > >
> > >
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