Status: Valid
Owner: ----
Labels: Type-Defect Priority-High Integration Concrete
New issue 3998 by [email protected]: summation(x**n/n, (n, 1, 400)) hangs
http://code.google.com/p/sympy/issues/detail?id=3998
summation(x**n/n, (n, 1, 400)) now hangs, instead of returning the same
thins as sum([x**n/n for n in range(1, 401)]) like it used to.
Control-Cing it shows that the hang-up happens while calling eval_sum_hyper.
In [2]: expr = summation(x**n/n, (n, 1, 400))
^C---------------------------------------------------------------------------
KeyboardInterrupt Traceback (most recent call last)
<ipython-input-2-4f1ee74508b7> in <module>()
----> 1 expr = summation(x**n/n, (n, 1, 400))
/home/ronan/devel/sympy/sympy/concrete/summations.py in summation(f,
*symbols, **kwargs)
444
445 """
--> 446 return Sum(f, *symbols, **kwargs).doit(deep=False)
447
448
/home/ronan/devel/sympy/sympy/concrete/summations.py in doit(self, **hints)
248 f = -f
249
--> 250 newf = eval_sum(f, (i, a, b))
251 if newf is None:
252 if f == self.function:
/home/ronan/devel/sympy/sympy/concrete/summations.py in eval_sum(f, limits)
548 # this can save time when b-a is big.
549 # We should try to transform to partial fractions
--> 550 value = eval_sum_symbolic(f.expand(), (i, a, b))
551 if value is not None:
552 return value
/home/ronan/devel/sympy/sympy/concrete/summations.py in
eval_sum_symbolic(f, limits)
642 return r
643
--> 644 return eval_sum_hyper(f, (i, a, b))
645
646
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