dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Fri, Oct 16, 2009 at 03:31:45PM +0200, Johan Hake wrote:
> On Friday 16 October 2009 15:24:42 Anders Logg wrote:
> > On Fri, Oct 16, 2009 at 03:14:24PM +0200, Johan Hake wrote:
> > > On Friday 16 October 2009 15:09:03 Anders Logg wrote:
> > > > Here's another problem I just ran into:
> > >
> > > You just keep bring it on do you!! ;)
> > >
> > > I wonder why I keep thinking:
> > >
> > >    unittest, unittest, unittest ...
> >
> > Good idea. :-)
> >
> > > > class BoundaryValue(Expression):
> > > >     def eval(self, values, x):
> > > >         values[0] = ...
> > > >
> > > > This works:
> > > >
> > > >   g = BoundaryValue(V)
> > > >
> > > > or
> > > >
> > > >   g = BoundaryValue(V=V)
> > > >
> > > > But this does not work:
> > > >
> > > >   g = BoundaryValue(element=element)
> > > >
> > > > I get this error:
> > > >
> > > > Exception: Swig director method error. Error detected when calling
> > > > 'Expression.eval_data'
> > > >
> > > > when calling bc.apply() with the above function as argument (which
> > > > results in a call to eval).
> > >
> > > Could you pass a minimal script that reproduce it so I can look into it?
> >
> > Sorry, my fault. I forgot that the "Swig director method" error
> > signals that I have done something wrong inside the eval function
> > which I had or rather I had initialized with the wrong element so I
> > wasn't allowed to set values[1]...
>
> Ok!
>
> It should be possible to access the original error message. That would have
> helped you in this case.

I think this worked a while back. If I remember correctly, Kent fixed
this at some point. (Getting sensible error messages when doing
something wrong inside a director callback.)

--
Anders

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