Opened 9 years ago
Closed 9 years ago
#13229 closed enhancement (fixed)
Adding `DegNegLex` to TermOrder
Reported by: | AlexanderDreyer | Owned by: | AlexanderDreyer |
---|---|---|---|
Priority: | major | Milestone: | sage-5.3 |
Component: | commutative algebra | Keywords: | |
Cc: | burcin, malb, PolyBoRi | Merged in: | sage-5.3.beta0 |
Authors: | Alexander Dreyer | Reviewers: | Martin Albrecht |
Report Upstream: | None of the above - read trac for reasoning. | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description (last modified by )
The attached patch adds the Degree Negative Lexicographical term order (DegNegLex
) to Sage 5.1.
It is defined as follows: x^{a} < x^{b} if and only if deg(x^{a}) < deg(x^{b}) or deg(x^{a}) = deg(x^{b}) and there exists 1 <= i <= n such that a_{1} = b_{ 1} , ... , a_{ i-1} = b_{ i-1}, ..., a_{i} > b_{i}.
It is a native term ordering of PolyBoRi
("dp_asc
") which Sage does not support yet. But Sage uses it internally to implement DegRevLex
-ordered BooleanPolynomialRing
s by reverting .gens()
. It is useful for Sage to distinguish between the original dp_asc
and DegRevLex
. It will help to fix some design issues discovered when fixing #13202.
Singular supports this as (a(1:n),ls(n))
. The patch also includes the patches for the interfaces libSingular
and Singular-pexpect.
- Apply: degneglex.patch
Attachments (1)
Change History (12)
comment:1 Changed 9 years ago by
- Status changed from new to needs_review
comment:2 Changed 9 years ago by
comment:3 Changed 9 years ago by
The patch looks good, i.e., reading it revealed no issues. So if doctests pass I say it's good to go.
comment:4 Changed 9 years ago by
Patchbot reports:
sage -t -force_lib devel/sage-13229/sage/rings/polynomial/multi_polynomial_libsingular.pyx ********************************************************************** File "/mnt/storage2TB/patchbot/Sage/sage-5.1.rc1/devel/sage-13229/sage/rings/polynomial/multi_polynomial_libsingular.pyx", line 1261: sage: singular(R) Expected: // characteristic : 0 // number of vars : 2 // block 1 : ordering a // : names x0 x1 // : weights 1 1 // block 2 : ordering rp // : names x0 x1 // block 3 : ordering C Got: // characteristic : 0 // number of vars : 2 // block 1 : ordering a // : names x0 x1 // : weights 1 1 // block 2 : ordering ls // : names x0 x1 // block 3 : ordering C **********************************************************************
comment:5 Changed 9 years ago by
Please reload the patch. (There was an intermediate patch, was this was wrong.)
comment:6 Changed 9 years ago by
Alright, let's see what the patchbot has to say about the current one then :)
comment:7 Changed 9 years ago by
Fixing that trailing whitespace issue (understanding how patch-bot works).
comment:8 Changed 9 years ago by
- Description modified (diff)
comment:9 Changed 9 years ago by
The patchbot green-lighted, so we have positive review here?
comment:10 Changed 9 years ago by
- Reviewers set to Martin Albrecht
- Status changed from needs_review to positive_review
comment:11 Changed 9 years ago by
- Merged in set to sage-5.3.beta0
- Resolution set to fixed
- Status changed from positive_review to closed
Replaced the patch, there was a wrong Singular ordering in the back.