Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium Series
New issue 3157 by asmeu...@gmail.com: limit() of hypergeometric function
does not work
http://code.google.com/p/sympy/issues/detail?id=3157
In [78]: print a
-2*hyper((1/2, 3/4), (3/2,), 2*exp_polar(I*pi)/(z - 1))/sqrt(z - 1)
In [79]: limit(a, z, 1)
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
/Users/aaronmeurer/Documents/Python/sympy/sympy/<ipython-input-79-c904e4ed1ee2>
in
<module>()
----> 1 limit(a, z, 1)
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/series/limits.pyc in
limit(e, z, z0, dir)
116 i, d = e.as_independent(z)
117 if i is not S.One and i.is_bounded:
--> 118 return i*limit(d, z, z0, dir)
119 else:
120 i, d = S.One, e
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/series/limits.pyc in
limit(e, z, z0, dir)
192
193 try:
--> 194 r = gruntz(e, z, z0, dir)
195 if r is S.NaN:
196 raise PoleError()
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/series/gruntz.pyc in
gruntz(e, z, z0, dir)
690 else:
691 raise NotImplementedError("dir must be '+' or '-'")
--> 692 r = limitinf(e0, z)
693
694 # This is a bit of a heuristic for nice results... we always
rewrite
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/cache.pyc in
wrapper(*args, **kw_args)
89 except KeyError:
90 pass
---> 91 func_cache_it_cache[k] = r = func(*args, **kw_args)
92 return r
93 return wrapper
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/series/gruntz.pyc in
limitinf(e, x)
470 e = e.subs(x, p)
471 x = p
--> 472 c0, e0 = mrv_leadterm(e, x)
473 sig = sign(e0, x)
474 if sig == 1:
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/cache.pyc in
wrapper(*args, **kw_args)
89 except KeyError:
90 pass
---> 91 func_cache_it_cache[k] = r = func(*args, **kw_args)
92 return r
93 return wrapper
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/series/gruntz.pyc in
mrv_leadterm(e, x)
553 w = Dummy("w", real=True, positive=True, bounded=True)
554 f, logw = rewrite(exps, Omega, x, w)
--> 555 series = calculate_series(f, w, logx=logw)
556 series = series.subs(log(w), logw) # this should not be
necessary
557 return series.leadterm(w)
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/series/gruntz.pyc in
calculate_series(e, x, skip_abs, logx)
506 f = e
507 for n in [1, 2, 4, 6, 8, 16]:
--> 508 series = f.nseries(x, n=n, logx=logx)
509 if not series.has(O):
510 # The series expansion is locally exact.
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/expr.pyc in
nseries(self, x, x0, n, dir, logx)
2343 return self.series(x, x0, n, dir)
2344 else:
-> 2345 return self._eval_nseries(x, n=n, logx=logx)
2346
2347 def _eval_nseries(self, x, n, logx):
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/mul.py in
_eval_nseries(self, x, n, logx)
1387 def _eval_nseries(self, x, n, logx):
1388 from sympy import powsimp
-> 1389 terms = [t.nseries(x, n=n, logx=logx) for t in self.args]
1390 return powsimp(Mul(*terms).expand(), combine='exp',
deep=True)
1391
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/expr.pyc in
nseries(self, x, x0, n, dir, logx)
2343 return self.series(x, x0, n, dir)
2344 else:
-> 2345 return self._eval_nseries(x, n=n, logx=logx)
2346
2347 def _eval_nseries(self, x, n, logx):
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/function.pyc in
_eval_nseries(self, x, n, logx)
415 supported.'''))
416 args = self.args
--> 417 args0 = [t.limit(x, 0) for t in args]
418 if any(t.is_bounded == False for t in args0):
419 from sympy import oo, zoo, nan
AttributeError: 'Tuple' object has no attribute 'limit'
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