On May 8, 6:27 pm, Minh Nguyen <nguyenmi...@gmail.com> wrote:
> On Fri, May 8, 2009 at 9:23 AM, Kwankyu <ekwan...@gmail.com> wrote:
>
> > Hi,
>
> > 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
>
> > Perhaps this is a bug. I am using Sage 3.4.2.rc0
>
> I get the same results with the stable sage-3.4.2:
>
> ----------------------------------------------------------------------
> | Sage Version 3.4.2, Release Date: 2009-05-05 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: R.<x,y>=PolynomialRing(QQ,2)
> sage: a=x^2+x*y+y
> sage: a.polynomial(x)
> x^2 + y*x + y
> sage:
> sage:
> sage: R.<x,y>=PolynomialRing(GF(5),2)
> sage: a=x^2+x*y+y
> sage: a.polynomial(x)
> ERROR: An unexpected error occurred while tokenizing input
> The following traceback may be corrupted or invalid
> The error message is: ('EOF in multi-line statement', (1314, 0))
>
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call last)
>
> /home/mvngu/.sage/temp/sage.math.washington.edu/25287/_home_mvngu__sage_init_sage_0.py
> in <module>()
>
> /scratch/mvngu/sage-3.4.2/local/lib/python2.5/site-packages/sage/rings/polynomial/multi_polynomial.so
> in sage.rings.polynomial.multi_polynomial.MPolynomial.polynomial
> (sage/rings/polynomial/multi_polynomial.c:5050)()
>
> /scratch/mvngu/sage-3.4.2/local/lib/python2.5/site-packages/sage/structure/parent.so
> in sage.structure.parent.Parent.__call__
> (sage/structure/parent.c:4121)()
>
> /scratch/mvngu/sage-3.4.2/local/lib/python2.5/site-packages/sage/structure/coerce_maps.so
> in sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (sage/structure/coerce_maps.c:3064)()
>
> /scratch/mvngu/sage-3.4.2/local/lib/python2.5/site-packages/sage/structure/coerce_maps.so
> in sage.structure.coerce_maps._call_
> (sage/structure/coerce_maps.c:2955)()
>
> /scratch/mvngu/sage-3.4.2/local/lib/python2.5/site-packages/sage/rings/polynomial/polynomial_ring.pyc
> in _element_constructor_(self, x, check, is_gen, construct, **kwds)
> 310 x = x.Polrev()
> 311
> --> 312 return C(self, x, check, is_gen, construct=construct, **kwds)
> 313
> 314 def is_integral_domain(self):
>
> /scratch/mvngu/sage-3.4.2/local/lib/python2.5/site-packages/sage/rings/polynomial/polynomial_zmod_flint.so
> in sage.rings.polynomial.polynomial_zmod_flint.Polynomial_zmod_flint.__init__
> (sage/rings/polynomial/polynomial_zmod_flint.c:10716)()
>
> /scratch/mvngu/sage-3.4.2/local/lib/python2.5/site-packages/sage/rings/polynomial/polynomial_zmod_flint.so
> in sage.rings.polynomial.polynomial_zmod_flint.Polynomial_template.__init__
> (sage/rings/polynomial/polynomial_zmod_flint.c:5115)()
>
> TypeError: 'tuple' object cannot be interpreted as an index
>
> --
> Regards
> Minh Van Nguyen
I wish some expert will look into this issue, although I am trying to
fix the problem myself.
Kwankyu
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