Dear John and all,
On Thu, 30 Oct 2008, John Peterson wrote:
>> It seems as if the thing is now running quite well for me. (I fixed some
>> bugs in the meantime, all of which were all on the application side.) I've
>> still not been able to test it in parallel though, since the cluster is
>> still making trouble. I hope this will be repaired soon (altough I've been
>> hoping this since several weeks now).
>
> Great. Depending on how big a cluster is needed, we might be able to
> get you a temporary account in the CFDLab where you could run over a
> gigabit ethernet network of workstations.
The cluster is up again. But my program doesn't run on it. (My
program links with our institute software, which is always difficult
to install elsewhere. It's our institute software that crashes the
program, not the shell matrix part.) I'll look at it later, because
at the moment some other work has popped up.
> Since the overwhelming sentiment seemed to be against a multiple
> inheritance hierarchy and more towards a 'pimpl' style design, I've
> worked up one more class diagram (attached) which takes into account
> Derek's ShellMatrix inheritance stuff as well.
I like that much better.
>> Another issue is a sensible example program that uses the shell matrix
>> concept. I think it should be sensible to have one since there are some
>> pitfalls (such as the correct constraining methods I mentioned last week).
>> Unfortunately, I cannot think of a sensible, simple example application.
>> (The one I'm working on is far too complicated for that purpose.) Does
>> anyone have a sensible idea?
>
> Well, any sort of arclength continuation problem can be decomposed
> into a sum of a sparse matrix and a rank-1 matrix having the form
> u*v'. See, for example: Barragy and Carey (though by now there is
> probably a newer, better reference) for a simple example employing the
> 'Bratu' problem. This seems like it might be do-able within the
> context of a simple example.
>
> @Article{Barragy_1988,
> author = {E.~Barragy and G.~F.~Carey},
> title = {{A Partitioning Scheme and Iterative Solution for Sparse
> Bordered Systems}},
> journal = {CMAME},
> volume = {70},
> pages = {321--327},
> year = {1988}
> }
Okay, I'll have a look at it when I get time for those things again.
Sorry for not having posted the last days. I haven't forgotten the
shell matrix project, I just don't have time at the moment.
Best Regards,
Tim
--
Dr. Tim Kroeger Phone +49-421-218-7710
[EMAIL PROTECTED], [EMAIL PROTECTED] Fax +49-421-218-4236
MeVis Research GmbH, Universitaetsallee 29, 28359 Bremen, Germany
Amtsgericht Bremen HRB 16222
Geschaeftsfuehrer: Prof. Dr. H.-O. Peitgen
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