If I'm understanding my problem correctly, I think I actually want it to evaluate... Is there a way to ask sympy to find all occurrences of exp() in an expression and replace them with Pow(E,...) or E**?
I've tried messing with replace, but I'm not sure I've got the syntax right... Alternatively, can I force evalf to drill down into the exp() arguments? On Saturday, April 4, 2015 at 5:37:24 PM UTC-7, Aaron Meurer wrote: > > Seems like another thing that > https://github.com/sympy/sympy/issues/4898 would fix. I think the only > way to create E**x is to use Pow(E, x, evaluate=False). > > The lambdify thing might be a separate bug. > > Aaron Meurer > > On Sat, Apr 4, 2015 at 5:04 PM, G B <[email protected] <javascript:>> > wrote: > > Hi-- > > > > exp() doesn't seem to evalf its arguments when evalf is called on it. > This > > is probably a bug, and if so I'll file an issue. In the mean time, is > there > > an easy way to get sympy to convert exp(x) expressions to E**x > expressions? > > > > exp(t*sqrt(5)).n() -> exp(t*sqrt(5)) > > > > E**(t*sqrt(5)).n() -> E**(2.23606797749979*t) > > > > I think this is causing me some trouble when converting complex > expressions > > to numpy via lambdify. I'm trying to lambdify a result from dsolve that > > includes square roots of very large integers (not sure where those large > > integers are coming from). When I try to execute the result, I get > > "AttributeError: 'int' object has no attribute 'sqrt'". > > > > I'll see if I can get the lambdify to trip up with a simple set of > inputs. > > Right now this is the culmination of a 100 cell IPython notebook... > > > > > > -- > > 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] <javascript:>. > > To post to this group, send email to [email protected] > <javascript:>. > > 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/e312e981-3e7b-4e6f-ae69-984c7e7ad9fc%40googlegroups.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/20ecfb7f-0284-4f69-9d0e-4bd8cb21dbbe%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
