dolfin team mailing list archive

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

Anders Logg wrote:
> On Fri, Apr 17, 2009 at 03:07:17PM +0800, Garth N. Wells wrote:
> > Anders Logg wrote:
> > > On Fri, Apr 17, 2009 at 08:59:43AM +0200, Johan Hake wrote:
> > > > On Friday 17 April 2009 03:32:26 Garth N. Wells wrote:
> > > > > Should we start moving to UFL-based forms for the DOLFIN demos? Is the
> > > > > only serious outstanding issue on the FFC side the correct determination
> > > > > of the quadrature order?
> > > > Not sure how this could be best done in PyDOLFIN. 
> > > >
> > > > We could add
> > > >
> > > >   from dolfin.ufl import *
> > > >
> > > > after each 
> > > >
> > > >   from dolfin import *
> > > >
> > > > in the demos. When this is done and it all just works(TM) we can move the 
> > > > files in the site-packages/dolfin/ufl directory down to site-packages/dolfin, 
> > > > and remove
> > > >
> > > >   from dolfin.ufl import *
> > > >
> > > > from the demos?
> > > >
> > > > Johan
> > > I suggest we just move everything to UFL at once and then solve any
> > > problems that we encounter.
> > >
> > > I'm intending to remove the .form support from FFC quite soon (maybe
> > > today).
> > >
> > > It's easier to fix things so that they work with UFL than to have two
> > > conflicting form languages work at the same time.
> > The quadrature issue is serious, so I think that it should be tackled 
> > before the transition, or at least a short-term plan for how to solve it 
> > should be in place.
> >
> > Garth
>
> Is it so serious? It's a small thing compared to what will happen when
> the .form support is removed from FFC (as in everything will be broken
> until fixed).

Results computed with the new and old formats will not, in general, be 
the same, so I considered it to be serious.


> What is the problem with the quadrature order. Is it
> extract_quadrature_order and estimate_quadrature_order not working
> properly in UFL? What is the difference between the two?

My most recent understanding is that these are not working as they should.

Garth