Hello Tristan,
> n = 100; d=3
> load DATA+'my_functions.py'
> coefficients = poly_expand(n,int(n**(1/d)),d)
> R.<t,s> = ZZ[]
> f = 0
> for c in coefficients:
> f += c*t^d
> d -= 1
> g = f.homogenize('s')
>
> Running this returns "AttributeError: 'GlobalPolynomialRing' object has no
> attribute '_first_ngens'".
>
Could it be that the elements of "coefficients" do not lie in ZZ but
elsewhere (e.g. in the symbolic ring)? Your example seems to work fine (at
least with Sage 6.1.beta2) if "coefficients" is a vector of elements of ZZ.
Peter
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