#6036: [with patch, needs review] a bug in polynomial() for
PolynomialRing(GF(5),2)
------------------------------+---------------------------------------------
Reporter: klee | Owner: Somebody
Type: defect | Status: new
Priority: minor | Milestone: sage-4.0.1
Component: basic arithmetic | Keywords:
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Description changed by klee:
Old description:
> This works:
>
> {{{
> sage: R.<x,y>=PolynomialRing(QQ,2)
> sage: a=x^2+x*y+y
> sage: a.polynomial(x)
> x^2 + y*x + y
> }}}
>
> But this does not work:
>
> {{{
> sage: R.<x,y>=PolynomialRing(GF(5),2)
> sage: a=x^2+x*y+y
> sage: a.polynomial(x)
> Traceback (most recent call last):
> ...
> TypeError: 'tuple' object cannot be interpreted as an index
> }}}
>
> The bug is essentially in:
> {{{
> sage: B=QQ[x]
> sage: print B({0:1,1:2})
> 2*x + 1
> sage: print B({(0,):1,(1,):2})
> 2*x + 1
> sage: B=GF(5)[x]
> sage: print B({0:1,1:2})
> 2*x + 1
> sage: print B({(0,):1,(1,):2})
> Traceback (most recent call last):
> ...
> TypeError: 'tuple' object cannot be interpreted as an index
> }}
>
> I think the second form is not acceptable. Then the function
> remove_from_tuple() in sage.rings.polynomial.multi_polynomial.pyx
> should be revised as it output (1,) from (1,2) for example
New description:
The patch 12159.patch modifies the code in remove_from_tuple() in
sage.rings.polynomial.multi_polynomial.pyx. The patch 12160.patch adds a
testing example in the docstring.
--
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6036#comment:2>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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