I'm sorry to bring this up again but there is a wrong result in one of the pulls (already merged) that was discussed here. I'm linking to the issue for future discussion:
http://code.google.com/p/sympy/issues/detail?id=2981 The problem is that solve(sin(x)/x,check=False) gives [0] as a solution, which is wrong (not because of a discontinuity). On 12 January 2012 23:54, Aaron Meurer <[email protected]> wrote: > Well, I'm flattered that you liked it so much. I think it should be > restructured a little, though, if it is to be included anywhere (I > didn't write it with documentation in mind, just as a response to some > of the things that were said in this thread). And I do think that a > document describing how to best deal with removable singularities in > SymPy would be helpful. > > So feel free to throw something up on the wiki. You can think of the > wiki as a breeding grounds for documents that can eventually go into > the main docs when they are matured. > > If anyone's interested, I did start writing up my thoughts about > automatic simplification a while back > (https://github.com/sympy/sympy/wiki/Automatic-Simplification). It's > still a work in progress, though. And it's just my opinion, so don't > take it as the final word on anything. > > Aaron Meurer > > On Wed, Jan 11, 2012 at 7:56 PM, Alexey U. Gudchenko <[email protected]> > wrote: > > 12.01.2012 01:56, [email protected] пишет: > >> What about just adding the last post by Aaron to the page about pitfalls > >> (or another page) and fixing > >> http://code.google.com/p/sympy/issues/detail?id=2978 (so x**2.0/x > >> automatically simplifies to x**1.0)? > >> > >> I agree that sympy strikes a good balance and I certainly think that in > >> most of our users work x**2.0/x is the same as x**1.0. > >> > >> And the additional argument about how slow it will be to check all those > >> assumptions is pretty convincing. > >> > > > > This letter is vary significant and clarify behavior of SymPy which > > concerns with those topics: > > > > automatic expressions transformation (SymPy policy) > > simplify > > singularities and continuity > > core description - (Mul.flatten policy) > > > > Of course we must add this to the wikipages and/or to the documentation. > > > > -- > > Alexey U. > > > > -- > > You received this message because you are subscribed to the Google > Groups "sympy" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > [email protected]. > > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > > > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
