ffc team mailing list archive

["Garth N. Wells" <g.n.wells@xxxxxxxxxx>]

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" :).


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
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--

Dr. Garth N. Wells
Faculty of Civil Engineering and Geosciences
Delft University of Technology
Stevinweg 1
2628 CN Delft
Netherlands

tel.   +31 15 278 7922
fax.   +31 15 278 6383
e-mail g.n.wells@xxxxxxxxxx
url    http://www.mechanics.citg.tudelft.nl/~garth