Hey Nicolas,
I would say this is like matrices: do you want the iterator for matrices
to iterate by default over all elements or rows? Currently the iterator
goes over all rows and you can call M.list() to get a flat list of entries.
Actually, this is a question for graded objects in general: should the
default iterator go over each graded component or all elements? I would say
there should be methods for both. My thought is the default iterator being
over graded components since each component might be infinite, but I don't
have a good/strong opinion/reason for this.
Best,
Travis
On Friday, July 11, 2014 7:24:25 AM UTC-7, Nicolas M. Thiery wrote:
>
> Hi path algebra fans!
>
> I am having doctests failures in #8678 because of the following
> "feature" of quiver path algebras:
>
> sage: P = DiGraph({1:{2:['a']}, 2:{3:['b']}}).path_semigroup()
> sage: A = P.algebra(GF(7))
> sage: A.list()
> [Free module spanned by [e_1, e_2, e_3] over Finite Field of size
> 7,
> Free module spanned by [a, b] over Finite Field of size 7,
> Free module spanned by [a*b] over Finite Field of size 7]
>
> And indeed ``A.__iter__`` states that it iterates over the homogeneous
> components of A. This sounds bad, since the general convention for
> parents is to have __iter__, list, ... iterate over its elements. And
> indeed some code that makes this assumption explodes.
>
> Can we just rename this feature? Is it actually useful?
>
> Cheers,
> Nicolas
> --
> Nicolas M. Thiéry "Isil" <nth...@users.sf.net <javascript:>>
> http://Nicolas.Thiery.name/
>
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