ffc team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, Dec 04, 2006 at 07:20:22PM +0100, Garth N. Wells wrote:
> 
> 
> Anders Logg wrote:
> > On Mon, Dec 04, 2006 at 06:03:41PM +0100, Garth N. Wells wrote:
> >>
> >> Anders Logg wrote:
> >>> I think of a node as a member of the dual basis for P in the
> >>> definition of a finite element in Brenner-Scott. A node in FFC is
> >>> always associated with an entity, like the second node of entity 0 of
> >>> an entity of dimension 1 (the second node on the first edge).
> >>>
> >>> So I would very much like to keep the name "node".
> >>>
> >> OK, but this does clash with accepted terminology. In both Brenner & 
> >> Scott and Ciarlet, nodes are defined as points.
> > 
> > Yes, when I look again, they do use "node" for a point, but also refer
> > to "nodal variables" as the name of the linear functional you evaluate
> > to get the "nodal value".
> >
> 
> Sure, this is normal FE terminology -  nodal variables for the degrees 
> of freedom at a node. Also, "nodal value" in general case should be 
> "nodal values" :).

ok, but how do you say this when the nodal variable is an integral
over an edge?

Can you still say "at a node"? Or is "node" not used then?

/Anders


> 
> Garth
> 
> >>> See also
> >>>
> >>>     http://www.fenics.org/hg/ufc?f=1e97408cde10;file=src/ufc/ufc.h
> >>>
> >>> where we have
> >>>
> >>>     tabulate_nodes()
> >>>     evaluate_node()
> >>>
> >> This is partly why I made the suggestions. I saw this terminology in 
> >> some code from Martin. "nodes" gives the impression of points.
> > 
> > ok. More opinions?
> > 
> > /Anders
> > 
> > 
> >> Garth
> >>
> >>> But we could discuss what to call it. Other opinions?
> >>>
> >>> /Anders
> >>>
> >>>
> >>> On Mon, Dec 04, 2006 at 05:22:22PM +0100, Garth N. Wells wrote:
> >>>> Could "node" be changed to to "dof" in FFC output? To me, a node 
> >>>> represents a position on an element at which one or more dofs live.
> >>>>
> >>>> Garth
> >>>> _______________________________________________
> >>>> FFC-dev mailing list
> >>>> FFC-dev@xxxxxxxxxx
> >>>> http://www.fenics.org/mailman/listinfo/ffc-dev
> >>> _______________________________________________
> >>> FFC-dev mailing list
> >>> FFC-dev@xxxxxxxxxx
> >>> http://www.fenics.org/mailman/listinfo/ffc-dev
> >>>
> >>
> >> _______________________________________________
> >> FFC-dev mailing list
> >> FFC-dev@xxxxxxxxxx
> >> http://www.fenics.org/mailman/listinfo/ffc-dev
> > _______________________________________________
> > FFC-dev mailing list
> > FFC-dev@xxxxxxxxxx
> > http://www.fenics.org/mailman/listinfo/ffc-dev
> > 
>