[SciPy-Dev] Adding new wrappers (dassl, daspk version 2, cvode version 2.7.0) to scipy.integrate?

Claus Führer claus@maths.lth...
Tue Jun 19 15:54:26 CDT 2012


Geoff Oxberry <goxberry <at> gmail.com> writes:

> 
> I posted a feature request ticket (#1678,
http://projects.scipy.org/scipy/ticket/1678) about this on
> the SciPy Dev Wiki, and Ralf Gommers suggested that I follow up on the
scipy-dev mailing list.
> 
> To recap the gist of my ticket, there are problems for which DVODE (currently
wrapped in
> scipy.integrate.ode) are inadequate, such as in computational combustion. It
would be helpful to
> researchers in combustion to wrap updated numerical integration libraries
(such as DASSL, DASPK, and
> CVODE); DAE solver wrappers would also be very helpful (technically, DASSL and
DASPK are DAE solvers, but
> one thing at a time here).
> 
> Since some of these wrappers already exist in scikits.odes, would it be
possible to merge them into
> scipy.integrate.ode? If so, in the process, could the Sundials wrappers also
be updated to operate with
> Sundials version 2.5.0 instead of Sundials version 2.4.0? The newest version
of Sundials contains only
> minor changes to the API (a few integer arguments are changed to long integers
to accommodate larger
> problem sizes), and several bugs are fixed.
> 
> There have been many e-mails on the Sundials-users mailing list requesting a
good, well-maintained and
> supported Python interface to Sundials with a reputable institution behind it.
It looks like
> scikits.odes is the best-maintained Python interface out there, since
pysundials and python-sundials
> are no longer maintained, and the Assimulo documentation uses some
nomenclature that is nonstandard in
> numerical analysis (which makes me doubt the software). Furthermore, I know
that users in the combustion
> community, frustrated with this situation, have implemented their own wrappers
to such solvers (see for
> instance, https://github.com/jwallen/PyDAS, written by a colleague of mine).
> 
> I am willing to help with this effort after I graduate (I am in the process of
finishing my PhD) in a few months.
> 
> Geoff
> 

Hi Geoff,
I am not sure if Assimulo is the tool you are looking for but your comment about
it makes me curious. As a co-author of this package and specialist in DAE
numerics since 25 years I would be grateful to learn in which aspects the
nomenclature is "non-standard" in numerical analysis. Can you give me some hints?
Best regards

Claus Führer
Professor in Numerical Analysis
Lund, Sweden




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