Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 1479 by smichr: cannot compute leadterm; series.leadterm
http://code.google.com/p/sympy/issues/detail?id=1479
This is perhaps related to issues 1213 but here is a very simple expression
that exhibits the problem:
>>> a,x
(a, x)
>>> limit(log(a-x),x,oo) #no problem here
oo
>>> limit((1/a-x),x,oo) #no problem here
-oo + 1/a
>>> limit(log(1/a-x),x,oo) #but this fails
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
File "sympy\series\limits.py", line 77, in limit
r = gruntz(e, z, z0, dir)
File "sympy\sympy\series\gruntz.py", line 487, in gruntz
return limitinf(e, z)
File "sympy\series\gruntz.py", line 333, in limitinf
c0, e0 = mrv_leadterm(e,x)
File "sympy\series\gruntz.py", line 391, in mrv_leadterm
mrv_leadterm_up = mrv_leadterm(e_up, x, Omega_up)
File "sympy\series\gruntz.py", line 402, in mrv_leadterm
return series.leadterm(wsym)
File "sympy\core\basic.py", line 2212, in leadterm
raise ValueError("cannot compute leadterm(%s, %s), got c=%s" % (self,
x, c))
ValueError: cannot compute leadterm(-log(a) - _w/a + log(-a/_w), _w), got
c=-log(_w)
/c
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