Updates:
Status: Accepted
Comment #5 on issue 1158 by ondrej.certik: regression: roots of polys
http://code.google.com/p/sympy/issues/detail?id=1158
I think neither problem in this issue is actually fixed:
In [1]: p1 = ((x-2)*(x+3)*(x-4)).expand()
In [2]: p1
Out[2]:
2 3
24 - 10⋅x - 3⋅x + x
In [3]: roots(p1,x)
Out[3]: {}
In [4]: roots(p1, x, cubics=True)
Out[4]: {-3: 1, 2: 1, 4: 1}
In [5]: p = x**4 - 6*x**3 - 21*x**2 + 118*x + 216
In [6]: roots(p,x,quartics=True)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
/home/ondra/repos/sympy/<ipython console> in <module>()
/home/ondra/repos/sympy/sympy/polys/rootfinding.pyc in roots(f, *symbols,
**flags)
256
257 for i, h in enumerate(poly_sqf(g)):
--> 258 for zero in roots_trivial(h):
259 if zeros.has_key(zero):
260 zeros[zero] += i+1
/home/ondra/repos/sympy/sympy/polys/rootfinding.pyc in roots_trivial(g)
226 elif n == 4:
227 if flags.get('quartics', False):
--> 228 zeros += roots_quartic(g)
229
230 return zeros
/home/ondra/repos/sympy/sympy/polys/rootfinding.pyc in roots_quartic(f)
72 r = c**2 + a**2*d - a*b*c
73
---> 74 r = cubic(1, p, q, r)
75
76 u = r[1] + r[2] - r[0]
NameError: global name 'cubic' is not defined
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