On Tue, Jan 13, 2015 at 4:41 PM, Amit Saha <[email protected]> wrote:
> On Wed, Jan 14, 2015 at 8:27 AM, Aaron Meurer <[email protected]> wrote: > > I don't think there are analytic solutions. The equation is equivalent to > > solving tan(x) = -x. > > > > Aaron Meurer > > > > On Tue, Jan 13, 2015 at 4:24 PM, Sergey Kirpichev <[email protected]> > > wrote: > >> > >> On Wednesday, January 14, 2015 at 1:14:01 AM UTC+3, Amit Saha wrote: > >>> > >>> Thanks for any insights into this and whether there is a workaround. > >> > >> > >> What do you expect instead and why? Not all algebraic equations > >> have analytic solutions. Mathematica can't do this eq as well. > > Thanks for the quick replies all. The Traceback made me wrongly > believe that perhaps sympy is doing something wrong. To be fair to > myself, I was also laid astray by: > > http://www.wolframalpha.com/input/?i=solve%282*x*cos%282*x%29+%2B+sin%282*x%29%29 You should always check when you get a traceback what the error type is. If it's NotImplementedError, then it just means it isn't implemented. Any other error is likely a bug (or it means you have bad input). I agree that tracebacks can be confusing. I think ideally solve would return an unevaluated Solve object when it can't find any solutions. Returning [] instead of raising NotImplementedError would probably not be a bad idea either (I seem to remember already doing something like this, but I may be thinking of something else). Aaron Meurer > > > Which gave me an approximate solution - I should have checked myself. > > Anyway, thanks all and sorry for the noise. > > -- > 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 [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CANODV3%3Dp%2BuOVb3apH2CFqDv4fg2V%3D1vfNUvr-dhia5WrcTZc5g%40mail.gmail.com > . > For more options, visit https://groups.google.com/d/optout. > -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6JVO1UsCMGcNUB4w%3DPc1tu-k8jaMu86SegGd5OU_FfGCw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
