#14693: Coercion of power series to symbolic ring
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Reporter: eviatarbach | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-5.11
Component: symbolics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Description changed by eviatarbach:
Old description:
> Coercing a power series to the symbolic ring doesn't work as expected:
>
> {{{
> sage: R.<t> = PowerSeriesRing(QQ)
> sage: p = R([1,2,3])
> sage: SR(p).variables()
> ()
> sage: diff(SR(p))
> 0
> }}}
>
> Perhaps it could be converted to a polynomial first and then coerced to
> the symbolic ring?
>
> {{{
> sage: SR(p.polynomial()).variables()
> (t,)
> sage: diff(SR(p.polynomial()))
> 6*t + 2
> }}}
New description:
Coercing a power series to the symbolic ring doesn't work as expected:
{{{
sage: R.<t> = PowerSeriesRing(QQ)
sage: p = R([1,2,3])
sage: SR(p).variables()
()
sage: diff(SR(p))
0
}}}
Perhaps it could be converted to a polynomial first and then coerced to
the symbolic ring?
{{{
sage: SR(p.polynomial()).variables()
(t,)
sage: diff(SR(p.polynomial()))
6*t + 2
}}}
Or maybe just raise an error (as per #13360)?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14693#comment:1>
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