Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium Polynomial
New issue 2887 by [email protected]: Bug with minpoly()
http://code.google.com/p/sympy/issues/detail?id=2887
In [43]: minpoly(S("-sqrt(5)/2 - 1/2 + (-sqrt(5)/2 - 1/2)**2"))
---------------------------------------------------------------------------
PolynomialError Traceback (most recent call last)
/Users/aaronmeurer/Documents/Python/sympy/sympy/<ipython-input-43-b239f810d715>
in
<module>()
----> 1 minpoly(S("-sqrt(5)/2 - 1/2 + (-sqrt(5)/2 - 1/2)**2"))
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/polys/numberfields.pyc
in
minimal_polynomial(ex, x, **args)
130 else:
131 F = [x - bottom_up_scan(ex)] + mapping.values()
--> 132 G = groebner(F, symbols.values() + [x], order='lex')
133
134 _, factors = factor_list(G[-1])
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/polys/polytools.pyc
in groebner(F, *gens, **args)
5435
5436 """
-> 5437 return GroebnerBasis(F, *gens, **args)
5438
5439 def is_zero_dimensional(F, *gens, **args):
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/polys/polytools.pyc
in __new__(cls, F, *gens, **args)
5462
5463 try:
-> 5464 polys, opt = parallel_poly_from_expr(F, *gens, **args)
5465 except PolificationFailed, exc:
5466 raise ComputationFailed('groebner', len(F), exc)
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/polys/polytools.pyc
in parallel_poly_from_expr(exprs, *gens, **args)
3672 """Construct polynomials from expressions. """
3673 opt = options.build_options(gens, args)
-> 3674 return _parallel_poly_from_expr(exprs, opt)
3675
3676 def _parallel_poly_from_expr(exprs, opt):
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/polys/polytools.pyc
in _parallel_poly_from_expr(exprs, opt)
3723
3724 try:
-> 3725 reps, opt = _parallel_dict_from_expr(exprs, opt)
3726 except GeneratorsNeeded:
3727 raise PolificationFailed(opt, origs, exprs, True)
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/polys/polyutils.pyc
in _parallel_dict_from_expr(exprs, opt)
276
277 if opt.gens:
--> 278 reps, gens = _parallel_dict_from_expr_if_gens(exprs, opt)
279 else:
280 reps, gens = _parallel_dict_from_expr_no_gens(exprs, opt)
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/polys/polyutils.pyc
in _parallel_dict_from_expr_if_gens(exprs, opt)
161 coeff.append(factor)
162 else:
--> 163 raise PolynomialError("%s contains an
element of the generators set" % factor)
164
165 monom = tuple(monom)
PolynomialError: sqrt(_a1) contains an element of the generators set
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