dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Fri, Apr 17, 2009 at 03:57:09PM +0800, Garth N. Wells wrote:
> 
> 
> 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.

Yes, they won't be the same but I thought they would still be correct
(as in possibly using a better quadrature rule than needed).

Kristian?

-- 
Anders


> > 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
> 
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