[Dune-devel] Semantics of {ghost,overlap}Size

[Andreas Dedner]

Hi.
I've wondered about that as well and am thinking that the method really only
makes sense for codim 0 (where it the semantics seems clear enough).

In DUNE everything boils down to codim 0 anyway (i.e. what leaf entities
are for example). So if I have an overlap of 2 codim 0 entities then
I would expect that the corresponding entities of higher codimension are
there
as well....

Does anybody use that method for c>0?

Best
Andreas

PS: should these method be deprecated on the grid class?

On 07/11/13 10:33, Markus Blatt wrote:
> Hi,
>
> I recently looked at the documentation off these methodsbut this did
> not help me understand what they are doing. It reads "Return size of
> ghost region for a given codim on the leaf grid" but it is not clear
> to me what this size is. 
>
> In the documentation of yaspgrid it says that size is the distance in
> graph, which is not really clearer. I assume that means the smallest
> path between any two entities on different borders of that
> region. Which still leaves the question open what the graph 
> of an enitity set of a given codim is. The vertices are of course the
> codim entities. Seems like the edges would be the codim 1 entities for
> elements and for all other entities with codim c the ones with codim c+1.
>
> Is there a precise definition somewhere?
>
> Markus