[dune-pdelab] dense backend

[Christian Engwer]

Dear all,

after a long time I sat down again and implemented the suggested
sparse matrix.

I created a new branch feature/sparsematrix.

As nobody came up with a better name I renamed the Dense backend to
Simple and added the SimpleSparseMatrixBackend. I updated the test and
the results are the same as for the dense matrix.

Perhaps we should even rename the SimpleMatrixBackend to SimpleDenseMatrixBackend?!

I'll start using it now and would like to merge it to master asap. The
main question is... would this commit interfere with the dune course?

Ciao
Christian

On Sun, Oct 13, 2013 at 04:13:13PM +0200, Christian Engwer wrote:
> On Sun, Oct 13, 2013 at 03:09:31PM +0200, Markus Blatt wrote:
> > On Fri, Oct 11, 2013 at 02:27:05PM +0200, Christian Engwer wrote:
> > > 
> > > This brings me to the actual questions. I'd like to rename the dense
> > > backend stuff to simple, as this is the actual idea here. We can then
> > > have a SimpleVectorBackend, SimpleDenseMatrixBackend and a
> > > SimpleSparseMatrixBackend. Any objections?
> > 
> > Simple does not ring any bell at my end. What should I associate
> > with such a name? This does not mean that i have a better name, though.
> > 
> > BTW: THere is a branch p/dominic/umfpack of istl that supports umfpack
> > and might provide a simple CSR Matrix, already. 
> 
> The main idea of Steffens code at that time was to have something
> which is really _simple_ and be used to implement backends, which
> build upon such simple data structures. Main main point is that dense
> is not a good name, as we can (and want to) have sparse matrices with
> simple data structures, but I don't object other names, if you have a
> better suggestions.
> 
> Christian
> 
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-- 
Prof. Dr. Christian Engwer 
Institut für Numerische und Angewandte Mathematik
Fachbereich Mathematik und Informatik der Universität Münster
Einsteinstrasse 62
48149 Münster

E-Mail	christian.engwer at uni-muenster.de
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