Comment #4 on issue 1224 by pevzi23: some errors in limit function
http://code.google.com/p/sympy/issues/detail?id=1224
I'm sorry, but so why I get that result, when there must be zero?
In [7]: x = Symbol('x', real=True)
In [8]: limit(x**(2/3)*sin(x**2)/(x-1), x, oo)
Out[8]: nan
Also, when I try 'limit(sin(x), x, oo)', I get an error instead of 'nan':
In [11]: limit(sin(x), x, oo)
---------------------------------------------------------------------------
PoleError Traceback (most recent call last)
/home/pevzi/<ipython console> in <module>()
/usr/lib/python2.6/site-packages/sympy/series/limits.pyc in limit(e, z, z0,
dir)
81 r = gruntz(e, z, z0, dir)
82 except PoleError:
---> 83 r = heuristics(e, z, z0, dir)
84 return r
85
/usr/lib/python2.6/site-packages/sympy/series/limits.pyc in heuristics(e,
z, z0, dir)
86 def heuristics(e, z, z0, dir):
87 if z0 == oo:
---> 88 return heuristics(e.subs(z, 1/z), z, sympify(0), "+")
89 elif e.is_Mul:
90 r = []
/usr/lib/python2.6/site-packages/sympy/series/limits.pyc in heuristics(e,
z, z0, dir)
100 return Add(*r)
101 elif e.is_Function:
--> 102 return e.subs(e.args[0], heuristics(e.args[0], z, z0, dir))
103 msg = "Don't know how to calculate the limit(%s, %s, %s,
dir=%s), sorry."
104 raise PoleError(msg % (e, z, z0, dir))
/usr/lib/python2.6/site-packages/sympy/series/limits.pyc in heuristics(e,
z, z0, dir)
102 return e.subs(e.args[0], heuristics(e.args[0], z, z0, dir))
103 msg = "Don't know how to calculate the limit(%s, %s, %s,
dir=%s), sorry."
--> 104 raise PoleError(msg % (e, z, z0, dir))
105
106
PoleError: Don't know how to calculate the limit(1/x, x, 0, dir=+), sorry.
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