[Dune] How children which are copies of their father handled in DUNE?

[Oliver Sander]

Hi Raffael,

>
> Hmm what I meant with std::distance(begin,end) is just the number of times that I have to increment begin until begin == end. So if I take again the example from my original question, 
> 
> (a)-------------(i)------(b)    level 0
> (c)------(d)----(j)               level 1,
>
> Then the leaf view contains nodes (c), (d), (i), (j), (b) so I assume that when I iterate through all nodes of the leaf view I will effectively get 5 nodes? (i.e. std::distance(leafView().begin<1>(), leafView().end<1>()) == 5 but
> leafView().size(1) == 4)
>

The vertices in a leaf view are equivalence classes of actual vertices.  Therefore
in your example (i) and (j) are actually the same thing.  Upon iterating over all
leaf vertices you will get (c), (c), (i/j), (b), i.e., four vertices.

Hope that helps,
Oliver


> 
>>
>>> 2) But I guess for any levelView this equality will hold because there are no
>> children and fathers (which could be copies of each other) in the same level
>> view?
>>>
>>> If this is so then I would suggest to update the documentation of the IndexSet
>> to something like this:
>>>
>>> The index map \f$ m \f$ has the following properties:
>>>   - Two entities have the same index if one is an exact copy of the other, i.e.
>> for any \f$ e, e' \in E_g^c \f$ we have \f$ e \mathcal{C} e' \rightarrow m(e) =
>> m(e')\f$ (this is only possible in leaf views)
>>>   - Otherwise they have different indices: For any \f$ e, e' \in E_g^c\f$ such
>> that \f$ e \neq e' \wedge  \neg( e \mathcal{C} e' ) \f$ then \f$ m(e) != m(e') \f$
>>>   - It is consecutive and zero-based within the subsets \f$ E_g^c / \mathcal{C}
>> \f$, i.e. we have \f$ 0 \leq m(e) < |E_g^c / \mathcal{C} | \f$ for any \f$ e \in
>> E_g^c\f$.
>>>
>>
>> Please open a bug report about this at
>> <http://www.dune-project.org/flyspray>. On this list it might simply get lost.
> 
> Okay, I'll do that in a moment when I'm sure I've understood the problem ;)
> 
> Thanks a lot in advance,
> Raffael
> 
>>
>> Cheers,
>>
>> Markus
>> --
>> Dr. Markus Blatt - HPC-Simulation-Software & Services http://www.dr-blatt.de
>> Hans-Bunte-Str. 8-10, 69123 Heidelberg, Germany,  USt-Id: DE279960836
>> Tel.: +49 (0) 160 97590858
> 
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