On Wed, Jan 14, 2015 at 8:53 AM, Aaron Meurer <[email protected]> wrote: > > > 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).
+1 for returning an empty list object - it's IMO user-friendly - way friendlier than a Traceback. > > 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. -- http://echorand.me -- 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/CANODV3kg1pJZHv%3DaGDnL9P1K06sS%2Bboi1NccM%3DkWmAA8VAfnOA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
