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() -
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 wrote:
> Hi--
>
> exp() doesn't seem to evalf
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...
Alternativ
You have to do evaluate=False because Pow(E, x) is automatically
converted to exp() otherwise.
You can use something like expr.replace(exp, lambda x: Pow(E, x,
evaluate=False)).
Aaron Meurer
On Sat, Apr 4, 2015 at 11:36 PM, G B wrote:
> If I'm understanding my problem correctly, I think I actua
Hey Aaron--
This bug came up to bite me again, so I tried your work around. The
replace you suggested doesn't work (I get the same result back).
What does seem to work is expr.replace(exp, lambda x: Pow(E, N(x)))
That forces the evaluation of the argument to exp, and then carries on.
Thanks
