#17254: Upgrade to Singular-4-0-2
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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 jakobkroeker):
@jpflori
Singulars degree function calls {{{pLDeg}}} and not {{{p_Deg}}},
(grep for '{{{jjDEG}}}' in Singular sources), so we should do the
same/similar by default.
one of the reasons: {{{p_Deg}}} seems returning garbage for lexicographic
orderings
(see comment 195)
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? Then we could(?) fix it using
a different appropriate call:
{{{
sage: sage: tord = TermOrder(matrix([3,0,1,1,1,0,1,0,0]))
sage: sage: R.<x,y,z> = PolynomialRing(QQ,'x',3,order=tord)
sage: sage: (x^3*y+x*z^4).degree() # 9
('p_Totaldegree', 4)
('p_WTotaldegree', 9)
('p_WDegree', 9)
('pFDeg', 4)
('pLDeg', 5)
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/17254#comment:196>
Sage <http://www.sagemath.org>
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