dolfin team mailing list archive

[Shawn Walker <walker@xxxxxxxxxxxxxxx>]

Alright, I will look at DoFmap.  That seems to be the more general way to 
do things.  Probably I will not know what I am doing!

- Shawn

On Sun, 26 Apr 2009, kent-and@xxxxxxxxx wrote:

> There are at least two ways to do this.
>
> 1) Create a submesh. Anders has implemented support for
>    submeshes but I don't know if it works on meshes that
>    have lower dim than the original. Anders has to tell you how
>    to proceed.
>
>
> 2) Change DofMap. As it is now DofMap checks if it has a precomputed
>    dof_map (array of integers). If it has this array it will not compute
>    it. Hence you need to create such an array. The array should contains
>    -1 for the values that should not be used. You create this array by
> running
>    over the part of the mesh that you want to use.
>
>    I suggest you start experimenting by adding a function to FunctionSpace
>    which again calls DofMap.  This function needs as input the structure
> that
>    you want to use to specify the subdomain.
>
> OK?
>
> Kent
>
>
> > I had asked a question a while back about having a finite element function
> > that was ONLY defined on the boundary.  If I wanted to put this in, what
> > parts of the code should I look at?  Or is it too complicated?
> >
> > - Shawn
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