[dune-functions] [Dune-functions-commit] [Commit] dune-functions - e7abafb: Add protocol for Aachen meeting

Oliver Sander sander at igpm.rwth-aachen.de
Wed Mar 26 18:12:51 CET 2014


> this possible non-consecutive indices are not a real problem. An other
> example is, at least in our current design, if you have a
> multi-physics problem. Then the locak tree contains all spaces for all
> sub-domains, but only the correct sub-tree is in a bound state. This
> is necessary in order to keep the C++ types fixed. 

I keep thinking that we may not want to support multi-physics problems
in this way.  It appears to make life much more difficult.
Multiplying two spaces defined on two different domains is something
different than multiplying two spaces on the same domain after all,
in that the product space is not isomorphic to a vector-valued space
on the common domain.  Maybe we should treat multi-physics be a
separate mechanism?
Cheers,
Oliver

In this situation
> you again have non-consecutive indices, because some of the entries in
> your tree don't contain any DOFs.
> 
> I hope this explains a little bit what the issues in our opinion are.
> 
> Ciao
> Christian
> 
>> Best,
>> Carsten
>>
>> Am 26.03.2014 10:00, schrieb Christian Engwer:
>>> Hi Carsten,
>>>
>>> We discussed this yesterday. There are many open questions regarding
>>> the backend interface and the multi index is one of them. In any case
>>> we have to specify the exact semantics of different versions of multi
>>> indices and this might them include that they are zero starting.
>>>
>>> Christian
>>>
>>>
>>> On 25. März 2014 21:54:37 MEZ, "Carsten Gräser" <graeser at mi.fu-berlin.de> wrote:
>>>> Hi Steffen,
>>>> didn't we decide that the global multi
>>>> indices should always be consecutive?
>>>> If not, we may also add a method to
>>>> check if a prefix does appear in any
>>>> index.
>>>>
>>>> Best,
>>>> Carsten
>>>>
>>>> On 25. März 2014 19:19:23 MEZ, "Steffen Müthing"
>>>> <muething at dune-project.org> wrote:
>>>>> New commit, appeared at Tue Mar 25 19:19:23 2014 +0100
>>>>> as part of the following ref changes:
>>>>>
>>>>>    branch refs/heads/master    updated from 3289b50 -> e7abafb
>>>>>
>>>>> Browsable version:
>>>>> http://cgit.dune-project.org/repositories/dune-functions/commit/?id=e7abafbf4a2892734c598c4984a633d4709a1cc2
>>>>>
>>>>> ======================================================================
>>>>>
>>>>> commit e7abafbf4a2892734c598c4984a633d4709a1cc2
>>>>> Author: Steffen Müthing <muething at dune-project.org>
>>>>> Da
>> 	
>>
>> -- 
>> Prof. Dr. Carsten Gräser
>> Freie Universität Berlin
>> Institut für Mathematik
>> Arnimallee 6
>> 14195 Berlin, Germany
>> phone: +49 30 838 75349
>> fax  : +49 30 838 54977
>> email: graeser at mi.fu-berlin.de
>> URL  : http://page.mi.fu-berlin.de/graeser
>>
>> _______________________________________________
>> dune-functions mailing list
>> dune-functions at dune-project.org
>> http://lists.dune-project.org/mailman/listinfo/dune-functions
> 


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