#12931: evaluation of coefficients of polynomials
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Reporter: chapoton | Owner: AlexGhitza
Type: defect | Status: closed
Priority: major | Milestone: sage-duplicate/invalid/wontfix
Component: algebra | Resolution: duplicate
Keywords: polynomials | Work issues:
Report Upstream: N/A | Reviewers: Travis Scrimshaw
Authors: | Merged in:
Dependencies: | Stopgaps:
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Changes (by jdemeyer):
* status: positive_review => closed
* resolution: => duplicate
Old description:
> It seems that substitution inside coefficients of a polynomial forgets to
> change the dominant term :
>
> {{{
> sage: rng=PolynomialRing(QQ,'q')
> sage: q=rng.gen()
> sage: x=PolynomialRing(rng,'x').gen()
> sage: po=q+(1+q)*x+(1+q+q**2)*x**2+(2+q)*x**3
> sage: po(q=1)
> (q + 2)*x^3 + 3*x^2 + 2*x + 1
> }}}
>
> Same behaviour in 4.8 and 5.0rc0
New description:
It seems that substitution inside coefficients of a polynomial forgets to
change the dominant term :
{{{
sage: rng=PolynomialRing(QQ,'q')
sage: q=rng.gen()
sage: x=PolynomialRing(rng,'x').gen()
sage: po=q+(1+q)*x+(1+q+q**2)*x**2+(2+q)*x**3
sage: po(q=1)
(q + 2)*x^3 + 3*x^2 + 2*x + 1
}}}
Same behaviour in 4.8 and 5.0rc0
Fixed by #3979.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12931#comment:6>
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