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Re: Contributing to GSL


Hello,

the TODO in ode-initval2 directory is slightly outdated. A BDF method has already been implemented in msbdf stepper in gsl-1.15. The selection of steppers in ode-initval2 is pretty nice, I think, as far as dense general-purpose ode-iv methods go. I sometimes thought about trying to implement Radau 5 method described in the second book (Hairer, E., Wanner, G., Solving Ordinary Differential Equations II: Stiff and Differential-Algebraic Problems) but never did. If you want to fight with ODEs, you could try that. However, I cannot promise I'd have much time to contribute.

DAEs (differential-algebraic equations) are a different story, even though they're close to ODEs. There's currently no DAE solver framework in GSL. It is something that would be very nice to have, though. If anyone is willing to try to design and implement one, feel free to do it!

BR,
Tuomo

On 03/28/2012 07:11 AM, Varad Deshmukh wrote:

Hi,
I am Varad Deshmukh, a Master's student at UCSB majoring in Computer
Science. My research interests are in Scientific Computing and HPC, and
I am interested in contributing to GSL. I recently took up a course in
numerical simulation and I figured a good way to start would be looking
into ODE solvers.

The TODO list mentions work to be done for adding other stepper
methods - especially the BDF methods for DAE's implemented in DASSL and
DASPK. Could you please elaborate more on which new methods you want to
focus on? I have been reading the code for the Runge-Kutta methods - the
driver, evolve and control formats - and have a rough idea about the
design.

It would be great if I could get some help regarding GSL development in
general and ode-initval2 in particular. If you feel that I should work
with smaller bugs and fix them before going into a new implementation, I
would like to hear suggestions.

Thank you,
Varad.



--
Tuomo.Keskitalo@iki.fi
http://iki.fi/tuomo.keskitalo


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