GSoC 2019 Proposal: Differential Equations

[gar...@hawk.iit.edu]

Hi everyone,

My name is Grace Arnold and I'm a computer science major at the Illinois Institute of Technology. I have a few years of experience with Java and Python, and have taken the Differential Equations course. I'm interested in contributing to SymPy's Differential Equations methods. Specifically, I see that general linear systems of more than two equations was mentioned in the project ideas. I would love to contribute to this project, but if anyone could provide me with more direction regarding this project (i.e. more desirable functions to be implemented within differential equations), then I would be happy to hear them!

I will be working on my proposal and more ideas soon and will post them here, if anyone would like to read it and tell me what I can improve upon.

Thank you co much,

Grace Arnold

 

[Oscar Benjamin]

Hi Grace,

I don't know where it is you're looking to see the proposals for
differential equations but I can tell you that the ODE systems code is
a bit of a mess right now. See the label solvers.dsolve on Github for
relevant issues/PRs.

At the moment there are many methods for very specific types of ODE
but many are untested and/or don't work and many obvious cases are
missing. What is needed is some good more general methods. In some
cases I have tried to come up with examples but I can't come up with
any example where the method is useful.

If I was going to spend time fixing this then I would firstly:

1. Try to improve test coverage for the systems methods that are there
2. Fix the constant coeff homogeneous case (there are existing stalled
PRs) and a number of open issues
3. Remove as many of possible of the methods that are special cases of 2.
4. Handle the non-homogeneous version of 2 (and remove corresponding
special cases)
5. Add a generalised version of the nth_algebraic ODE solver that can
be used for simple ODE systems.

There will still be plenty more to do after that.

A good way to start working on this would be to identify the untested
methods and try to add tests for them. (If you run test_ode with
coverage testing enabled you can see which ones are covered).

--
Oscar

> --
> You received this message because you are subscribed to the Google Groups "sympy" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to sympy+un...@googlegroups.com.
> To post to this group, send email to sy...@googlegroups.com.
> Visit this group at https://groups.google.com/group/sympy.
> To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/44e5d117-da3a-41fb-a227-684c1de98e8c%40googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.

[Aaron Meurer]

Also please be aware of the patch requirement. The pull request should be submitted by the application deadline (it's ok if it isn't merged by then). 

https://github.com/sympy/sympy/wiki/GSoC-2019-Application-Template. The deadline is only in a few days. 

Aaron Meurer 

To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAHVvXxRP0icL01vD%3Dqb7mg33j8DsHorMMXWj--YHYSBC3rmS-g%40mail.gmail.com.