Another good resource for what's there and what doesn't work yet is
https://github.com/sympy/sympy/blob/master/doc/src/modules/solvers/solveset.rst
.
Personally, I'd like to see solutions from equations involving
trigonometric expressions improved. Right now you will often get an answer
but it is not as simple as it could be (maybe this is more an issue of
simplifying set expressions). For example, solveset(sin(x), domain=S.Reals)
gives {2⋅n⋅π | n ∊ ℤ} ∪ {2⋅n⋅π + π | n ∊ ℤ} but it would be better if it
gave {n⋅π | n ∊ ℤ}. I suggested a potential way to fix this at
https://github.com/sympy/sympy/pull/9500#discussion_r39220151. Fixing this
by improving simplifying set expressions would be nice because then it
would work even for set expressions that don't come directly from solveset.
A related use-case I found where solveset fails is solving f(x) = f(x + a)
for a not dependent on x. The ability to solve this in the positive or the
negative would tell you if f(x) is periodic (and its period if it is). This
currently fails even for sin(x) (https://github.com/sympy/sympy/issues/10426
).
Aaron Meurer
On Wed, Feb 3, 2016 at 2:05 PM, Shekhar Prasad Rajak <
shekharrajak.1...@gmail.com> wrote:
>
> Hello,
> my name is Shekhar Prasad Rajak.I want to discuss about Solver and
> Solveset module
> https://github.com/sympy/sympy/wiki/GSoC-2016-Ideas#solvers .I am going
> to apply for GSoc'16, so trying to know
> what sympy community expecting.
> Solveset came to Replace all internal solve() calls
> https://github.com/sympy/sympy/issues/8711
> So I should focus on Solveset,right?
> I have some questions :
> 1.What are the main problems/issues in Solver and Solveset right now?
> 2.Is Solveset module done?If not,what are the main features, that should
> be added ?
> I have seen Harsh's PR : https://github.com/sympy/sympy/pull/7523
> It seems, these need some works :
> -functions solvable by LambertW
> -functions that can be recast as polynomials with a change of variables
> this, for example; this can be
> factored out of solve where multiple generators are handled
> -use something like this :
> https://github.com/sympy/sympy/pull/7523#issuecomment-62198981
> to handle the XFAILed test test_real_imag_splitting1, this will be
> handled in the set module.
>
> 3.This is list of Issues/ Discussions I found.
>
> https://github.com/sympy/sympy/wiki/GSoC-2014-Application-Harsh-Gupta:-Solvers#relevant-issues-discussions-and-references
> <https://github.com/sympy/sympy/wiki/GSoC-2014-Application-Harsh-Gupta:-Solvers#relevant-issues-discussions-and-references>
> but I don't know, whether they are solved or not.
> Issues which are still open in github repo, need solutions.
> There are also links of pdf and research papers, I am not sure whether
> they are implemented or not.
>
> 4.Can we use python library multiprocessing,Synchronization for the faster
> execution?one issue was opened for the same,which is closed now.But it is
> always better to take less time.
>
>
> --
> Shekhar Prasad Rajak
>
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