Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium Series WrongResult
New issue 3136 by [email protected]: Series of ((N - 1)**D + 1)/(N**D -
1) fails
http://code.google.com/p/sympy/issues/detail?id=3136
Simple issue:
In [32]: D = Symbol("D")
In [33]: N = Symbol("N")
In [34]: series(((N - 1)**D + 1)/(N**D - 1), x=N)
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call last)
/home/raoul/<ipython-input-34-422bace3104b> in <module>()
----> 1 series(((N - 1)**D + 1)/(N**D - 1), x=N)
/home/raoul/python/sympy/series/series.pyc in series(expr, x, x0, n, dir)
6 """
7 expr = sympify(expr)
----> 8 return expr.series(x, x0, n, dir)
/home/raoul/python/sympy/core/expr.pyc in series(self, x, x0, n, dir)
2201 if o:
2202 # make sure the requested order is returned
-> 2203 ngot = o.getn()
2204 if ngot > n:
2205 # leave o in its current form (e.g. with
x*log(x)) so
/home/raoul/python/sympy/core/expr.pyc in getn(self)
771 return abs(oi.exp)
772
--> 773 raise NotImplementedError('not sure of order of %s' % o)
774
775 def count_ops(self, visual=None):
NotImplementedError: not sure of order of 2/log(N)**6
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