Updates:
Labels: EasyToFix
Comment #3 on issue 3889 by [email protected]: expand_log(exp(x),
force=True) should give x
http://code.google.com/p/sympy/issues/detail?id=3889
It's me that sent the patch...someone else can take this as an EasyToFix.
diff --git a/sympy/functions/elementary/exponential.py
b/sympy/functions/elementary/exponential.py
index 8c749cd..9d15d7e 100644
--- a/sympy/functions/elementary/exponential.py
+++ b/sympy/functions/elementary/exponential.py
@@ -594,11 +594,10 @@ def _eval_expand_log(self, deep=True, **hints):
else:
nonpos.append(x)
return Add(*expr) + log(Mul(*nonpos))
- elif arg.is_Pow:
- if force or (arg.exp.is_real and arg.base.is_positive) or \
- arg.base.is_polar:
- b = arg.base
- e = arg.exp
+ elif arg.is_Pow or isinstance(arg, exp):
+ b, e = arg.as_base_exp()
+ if force or (e.is_real and b.is_positive) or \
+ b.is_polar:
a = self.func(b)
if isinstance(a, log):
return unpolarify(e) * a._eval_expand_log(**hints)
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