dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, Jun 03, 2008 at 12:53:38PM +0200, Martin Sandve Alnæs wrote:
> 2008/5/22 Anders Logg <logg@xxxxxxxxx>:
> > On Mon, May 19, 2008 at 09:31:16AM +0200, Martin Sandve Alnæs wrote:
> >> Regarding adding sparsity pattern information to an ufc::form, it seems to me
> >> it should be part of the *integral classes, one
> >> tabulate_sparsity_pattern to match
> >> each tabulate_tensor, plus a num_nonzeros() function.
> >
> > I don't understand what tabulate_sparsity_pattern is supposed to do.
> > Should it tabulate the full matrix sparsity pattern, or is it some
> > kind of "equation sparsity pattern" tabulating which components of a
> > system meet which components?
> >
> 
> I mean tabulating which element tensor entries are
> always zero independent of the cell and coefficients.
> An "equation sparsity pattern", which may be different
> for each *_integral class.
> 
> It will then be the task of DOLFIN to build a better global sparsity
> pattern based on these local element sparsity patterns.

ok, I see now. Sounds good.

-- 
Anders