Status: Accepted
Owner: ness...@googlemail.com
Labels: Type-Defect Priority-Medium
New issue 2387 by ness...@googlemail.com: Evalf of trig functions with
imaginary arguments
http://code.google.com/p/sympy/issues/detail?id=2387
In [1]: cosh(sqrt(I+0.5)).n()
Out[1]:
⎛ ⎽⎽⎽⎽⎽⎽⎽⎽⎽⎞
cosh⎝╲╱ 0.5 + ⅈ ⎠
Similarly for other trig functions.
The following one-line patch solves this:
--- a/sympy/core/power.py
+++ b/sympy/core/power.py
@@ -539,6 +539,9 @@ def _eval_derivative(self, s):
return self * (dexp * C.log(self.base) + dbase *
self.exp/self.base)
def _eval_evalf(self, prec):
+ return self.evalf(prec)
+ '''
+ def _eval_evalf(self, prec):
base, exp = self.as_base_exp()
base = base._evalf(prec)
if not exp.is_Integer:
@@ -547,6 +550,7 @@ def _eval_evalf(self, prec):
base = base.conjugate() / (base *
base.conjugate())._evalf(prec)
exp = -exp
return Pow(base, exp).expand()
+ '''
[evalf() caters for Pow on its own], but this hardly seems like "the rigth
way" :D.
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