Hi
Is this a bug ?
>>> from __future__ import division >>> from sympy import * >>> x, y, z, t
= symbols('x y z t') >>> k, m, n = symbols('k m n', integer=True) >>> f, g,
h = symbols('f g h', cls=Function) Documentation can be found at
http://docs.sympy.org/0.7.6.
>>> summation(1/((k+3.5)*(k+8)), (k, 1, n))
Traceback (most recent call last): File "<string>", line 1, in <module>
File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/concrete/summations.py",
line 454, in summation return Sum(f, *symbols, **kwargs).doit(deep=False)
File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/concrete/summations.py",
line 169, in doit newf = eval_sum(f, (i, a, b)) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/concrete/summations.py",
line 559, in eval_sum value = eval_sum_symbolic(f.expand(), (i, a, b)) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/concrete/summations.py",
line 656, in eval_sum_symbolic return eval_sum_hyper(f_orig, (i, a, b))
File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/concrete/summations.py",
line 725, in eval_sum_hyper res1 = _eval_sum_hyper(f, i, a) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/concrete/summations.py",
line 666, in _eval_sum_hyper return _eval_sum_hyper(f.subs(i, i + a), i, 0)
File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/concrete/summations.py",
line 705, in _eval_sum_hyper return f.subs(i, 0)*hyperexpand(h),
h.convergence_statement File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/simplify/hyperexpand.py",
line 2482, in hyperexpand return f.replace(hyper,
do_replace).replace(meijerg, do_meijer) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/core/basic.py",
line 1351, in replace rv = bottom_up(self, rec_replace, atoms=True) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/simplify/simplify.py",
line 4082, in bottom_up rv = F(rv) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/core/basic.py",
line 1336, in rec_replace new = _value(expr, result) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/core/basic.py",
line 1280, in <lambda> _value = lambda expr, result: value(*expr.args) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/simplify/hyperexpand.py",
line 2471, in do_replace r = _hyperexpand(Hyper_Function(ap, bq), z,
rewrite=rewrite) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/simplify/hyperexpand.py",
line 2052, in _hyperexpand formula = try_lerchphi(func) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/simplify/hyperexpand.py",
line 1793, in try_lerchphi part = apart(numer/denom, t) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/utilities/decorator.py",
line 35, in threaded_func return func(expr, *args, **kwargs) File
"/base/data/home/apps/s~sympy-live-hrd/45.380685391411058699/sympy/sympy/polys/partfrac.py",
line 86, in apart raise PolynomialError(msg) PolynomialError:
RisingFactorial(_t + 1, 8.0) contains an element of the generators set
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