Comment #2 on issue 1471 by ronan.l...@gmail.com:
integrate(1/(x**3+1),(x,0,oo)) return an expression with x
http://code.google.com/p/sympy/issues/detail?id=1471
What makes it fail is that
>>> (atan(1/x)).nseries(x, 0, 2)
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "D:\Boulot\Projets\sympy-git\sympy\sympy\core\basic.py", line 2125,
in nseries
return self._eval_nseries(x, x0, n)
File "D:\Boulot\Projets\sympy-git\sympy\sympy\core\function.py", line
290, in
_eval_nseries
raise PoleError("Cannot expand around %s" % (arg))
PoleError: Cannot expand around 1/x
I've made a patch that sidesteps the issue by replacing terms of a sum by
their
finite limit when it can be obtained by simple substitution.
Attachments:
0001-Compute-the-finite-parts-of-the-limit-of-a-sum-by-di.patch 2.2 KB
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