Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 1307 by mattpap: limit((3**(1/x)+5**(1/x))**x, x, 0) does not work
http://code.google.com/p/sympy/issues/detail?id=1307
In [1]: limit((3**(1/x)+5**(1/x))**x, x, 0)
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/home/matt/repo/git/sympy/<ipython console> in <module>()
/home/matt/repo/git/sympy/sympy/series/limits.pyc in limit(e, z, z0, dir)
75
76 try:
---> 77 r = gruntz(e, z, z0, dir)
78 except PoleError:
79 r = heuristics(e, z, z0, dir)
/home/matt/repo/git/sympy/sympy/series/gruntz.pyc in gruntz(e, z, z0, dir)
494 elif dir == "+":
495 e0 = e.subs(z,z0+1/x)
496 else:
497 raise NotImplementedError("dir must be '+' or '-'")
--> 498 return limitinf(e0, x)
/home/matt/repo/git/sympy/sympy/series/gruntz.pyc in limitinf(e, x)
331 if e.has(log):
332 e = e.normal()
--> 333 c0, e0 = mrv_leadterm(e,x)
334 sig=sign(e0,x)
335 if sig==1: return S.Zero # e0>0: lim f = 0
/home/matt/repo/git/sympy/sympy/series/gruntz.pyc in mrv_leadterm(e, x,
Omega)
398 wsym = Symbol("w", real=True, positive=True, dummy=True)
399 f, logw=rewrite(e, set(Omega), x, wsym)
--> 400 series = calculate_series(f, wsym)
401 series=series.subs(log(wsym), logw)
402 return series.leadterm(wsym)
/home/matt/repo/git/sympy/sympy/series/gruntz.pyc in calculate_series(e, x)
364
365 f = e
--> 366 series=f.nseries(x, 0, 2).removeO()
367 if series == 0:
368 #we need to calculate more terms, let's try 4:
/home/matt/repo/git/sympy/sympy/core/basic.pyc in nseries(self, x, x0, n)
2104 See also lseries().
2105 """
-> 2106 return self._eval_nseries(x, x0, n)
2107
2108 def _eval_nseries(self, x, x0, n):
/home/matt/repo/git/sympy/sympy/core/power.pyc in _eval_nseries(self, x,
x0, n)
591 # bs -> lt + rest -> lt * (1 + (bs/lt - 1))
592 return (lt**e * ((bs/lt).expand()**e).nseries(x,
--> 593 x0, n-e)).expand() + order
594 return bs**e+order
595 o2 = order * (b0**-e)
/home/matt/repo/git/sympy/sympy/core/basic.pyc in nseries(self, x, x0, n)
2104 See also lseries().
2105 """
-> 2106 return self._eval_nseries(x, x0, n)
2107
2108 def _eval_nseries(self, x, x0, n):
/home/matt/repo/git/sympy/sympy/core/power.pyc in _eval_nseries(self, x,
x0, n)
617 except TypeError:
618 #well, the n is something more complicated
(like 1+log(2))
--> 619 n = int(n.evalf()) + 1
620 assert n>=0,`n`
621 l = []
TypeError: int() argument must be a string or a number, not 'Add'
Example was taken from http://axiom-wiki.newsynthesis.org/SandBoxSymPy
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