[Dune] Which set of elements does a particular vertex belong to?

[Jayesh Badwaik]

Hi,

Actually I wanted to calculate the gradient on unstructured grid data in the
way the
VTK people do...  For calculating the gradient at a vertex, they calculate
the gradients
in all the elements which the vertex belongs to and then take an average...
Hence, I needed the functionality.

I am not able to come up with an alternative method.

Cheers and Regards
Jayesh Vinay Badwaik
Electronics and Communication Engineering
VNIT, Nagpur
INDIA

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"We are servants rather than masters in mathematics" -- Charles Hermite



On Sat, Aug 6, 2011 at 5:10 PM, Jö Fahlke <jorrit at jorrit.de> wrote:

> > Is there any method to get a list of set of elements does a particular
> > vertex (entity of codim dim)
> > belong to?
>
> Not directly.  If you really need it, you'll have to iterate through the
> whole
> grid and look whether the vertex you are looking for is a codim=dim
> subentity
> of the current element.  This is of course expensive.
>
> Particular grid managers may provide this functionality directly, but I
> don't
> know of any and tis is of course outside the scope of the Dune interface.
>
> Most finite element algorithms can be reorganized to not require something
> like this, however.
>
> Bye,
> Jö.
>
> --
> "Ich habe eine Maschine erfunden, die den Kommerz aus Weihnachten
> entfernt." -- "Lass uns ganz viele davon bauen und für viel Geld
> verkaufen."
> -- http://www.nichtlustig.de/toondb/021220.html
>
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