Hi Mateusz,
On Apr 16, 4:10 pm, Mateusz Paprocki <matt...@gmail.com> wrote:
> > What exactly is gens here? I thought it was supposed to be a list that
> > contains all the symbols in the polynomials, but then I eventually run
> > into this error
>
> > /tmp/mattpap-sympy-polys-cd30a32/sympy/polys/polytools.py in
> > _init_poly_from_list(list_rep, *gens, **args)
> > 286
> > 287 if len(gens) != 1:
> > --> 288 raise PolynomialError("can't create a multivariate
> > polynomial from a list")
>
> gens is just a list of symbols. The error tells you that you can't create
> multivariate polynomials using nested lists. Use dictionaries instead. E.g.:
> Poly([1,2,3], x) is ok, but not Poly([[1],[2],[3]], x, y), use Poly({(2,0):
> 1, (1,0): 2, (0,0): 3}, x, y).
If gens can be a non-nested list, then maybe there is a bug in quo() ?
When gens is a non-nested list, I can get all the way through your
tutorial, i.e. everything through this works:
fgh = basic_from_dict(dict(FGH), *gens)
but I get PolynomialError("can't create a multivariate polynomial from
a list") from
test = quo(FGH, 1, *gens)
and also if 1 is replaced with a polynomial generated from gens.
Thanks,
Ben
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