On Sep 19, 11:41 am, Burcin Erocal <bur...@erocal.org> wrote:
> On Fri, 18 Sep 2009 09:34:35 -0700 (PDT)
>
> kcrisman <kcris...@gmail.com> wrote:
> > I don't know if there is a way to get at where coefficients of
> > elements in SR come from; they all just become symbolic expressions.
> > Even with the .coeffs() method, they still end up coming out as
> > symbolic expressions. Burcin or others will clarify, but probably the
> > idea was that symbolic means just that - symbolic, with no reference
> > to other things.
>
> Symbolic expressions keep python objects for numeric values or
> coefficients. You can get at the python object wrapped by an expression
> using the .pyobject() method and ask for its parent.
>
> sage: t = Mod(3,5)
> sage: t.parent()
> Ring of integers modulo 5
> sage: u = SR(t)
> sage: u
> 3
> sage: u.parent()
> Symbolic Ring
> sage: u.pyobject().parent()
> Ring of integers modulo 5
>
> Cheers,
> Burcin
Thanks, that was very informative!
- kcrisman
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