#13257: Coercion from `ZZ['x']` to `Integers(n)['x']` is VERY slow
------------------------------------+---------------------------------------
Reporter: jlopez | Owner: robertwb
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.7
Component: coercion | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Travis Scrimshaw | Merged in:
Dependencies: | Stopgaps:
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Comment (by tscrim):
Replying to [comment:6 robertwb]:
> Won't this patch break
>
> {{{
> sage: R.<x> = ZZ[]
> sage: S.<y> = R[]
> sage: S._element_constructor_(x^2)
> x^2
> }}}
>
Yes it does:
{{{
sage: S._element_constructor_(x^2)
y^2
}}}
> I think polynomial_template should be fixed, at the cost of requiring a
couple more special methods.
I'll see what I can do.
Thanks,[[BR]]
Travis
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13257#comment:7>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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