#17254: Upgrade to Singular-4-0-2
-------------------------------------+-------------------------------------
Reporter: jdemeyer | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.2
Component: packages: | Resolution:
standard | Merged in:
Keywords: | Reviewers:
Authors: Jakob Kroeker, | Work issues:
Jean-Pierre Flori, Jeroen Demeyer | Commit:
Report Upstream: N/A | 88ce71f30b3d013eac38df7470679caec832f15f
Branch: | Stopgaps:
u/jakobkroeker/ticket.17254.Jeroen_Demeyer.version|
Dependencies: |
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Comment (by john_perry):
Replying to [comment:196 jakobkroeker]:
> Question: is the behaviour described in the documentation of the
'degree' function in sage
> {{{
> Note that a matrix term ordering alters the grading of the generators
> of the ring; see the tests below. To avoid this behavior, use
either
> ``exponents()`` for the exponents themselves, or the optional
> argument ``std_grading=False``.
> }}}
>
> natural and is it what a user would expect?
I bumped into this a long time ago. It shocked me then, but I adapted &
now my code depends on it. If this is true of me, it is probably true of
others.
This, for example, is from Sage 6.7:
{{{
sage: T = TermOrder(matrix(3,3,[1,2,3,3,4,5,0,0,1]))
sage: R.<x,y,z> = PolynomialRing(QQ,'x',3,order=T)
sage: y.degree()
2
sage: version()
'SageMath Version 6.7, Release Date: 2015-05-17'
}}}
So IMHO we should mimic Singular for compatibility reasons (i.e., we're
mimicking Sage itself).
--
Ticket URL: <http://trac.sagemath.org/ticket/17254#comment:197>
Sage <http://www.sagemath.org>
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