Status: Accepted
Owner: [email protected]
Labels: Type-Defect Priority-Medium
New issue 2336 by [email protected]: unevaluated Limit uses non-Basic arg
http://code.google.com/p/sympy/issues/detail?id=2336
The direction of the limit is a string '+' or '-' which causes problems
with subs:
h[18] >>> _.subs(x,y)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\core\basic.py", line 958, in subs
return self._subs_old_new(old, new)
File "sympy\core\cache.py", line 101, in wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "sympy\core\basic.py", line 967, in _subs_old_new
return self._eval_subs(old, new)
File "sympy\core\basic.py", line 973, in _eval_subs
return self.func(*[arg._eval_subs(old, new) for arg in self.args])
AttributeError: 'str' object has no attribute '_eval_subs'
The short term fix is to make this +/-1. In the long term when limits can
be evaluated in any direction (other than real) then a new Direction object
will be needed.
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