#11316: Weighted degree term orders added
--------------------------------+-------------------------------------------
Reporter: klee | Owner: AlexGhitza
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7.1
Component: basic arithmetic | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Kwankyu Lee
Merged: | Dependencies:
--------------------------------+-------------------------------------------
Comment(by SimonKing):
With the fourth patch, it is still allowed to do
{{{
sage: N.<a,b,c> = PolynomialRing(QQ, 3,
order=TermOrder('wdeglex',[0,-2,3]))
}}}
There should an error be raised, because negative degrees do not work at
all, due to the limitations imposed by Singular:
{{{
sage: a
0*a
}}}
Another example:
{{{
sage: N.<a,b,c> = PolynomialRing(QQ, 3,
order=TermOrder('wdeglex',[1.1,2,3]))
sage: a.degree()
1
}}}
Hence, one may think that the degree is converted to an integer. But in
fact the "broken" value of the degree is still hanging around:
{{{
sage: singular(N)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
...
TypeError: Singular error:
? no ring active
? error occurred in or before STDIN line 27: `ring sage7=0,(a, b,
c),Wp(1.10000000000000,2,3);`
? expected ring-expression. type 'help ring;'
}}}
I am not sure what to do in the second case: Raise an error, or silently
convert `1.1` to `1`?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11316#comment:31>
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