#10716: Adding a weighted_degree function to Singular multivariate polynomials
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Reporter: jsrn | Owner: AlexGhitza
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-6.3
Component: algebraic | Resolution:
geometry | Merged in:
Keywords: multivariate | Reviewers: Marshall Hampton
polynomials,degree,Singular | Work issues:
Authors: Johan S. R. | Commit:
Nielsen, Luis Felipe Tabera | 1036282f26205edced3fe67a6ba8f5a8969feb59
Alonso | Stopgaps:
Report Upstream: N/A |
Branch: |
u/lftabera/weighted_degree |
Dependencies: |
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Comment (by lftabera):
I would not say that zero.degree() == -1 is a bug, but a feature.
The use of `int`s instead of `ZZ` is just for compatibility with the
current degree method. In both `MPolynomial_libsingular` and
`MPolynomial_polydict` polynomials the degree returns an `int`.
This method is intended for casual computations with weighted degree or
with several weighted degrees at one. If the user is going to use heavy
computations with the same weight on a Singular ring, it is better to set
up a ring with the appropiated weighted degree as term order. This would
use Singular internal method.
I should check, but if I recall correctly, to use Singular inner function
one has the change the degree of the underlying ring, which is bad.
Moreover, this patch also work for `MPolynomial_polydict`, not only rings
mapped to Singular.
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Ticket URL: <http://trac.sagemath.org/ticket/10716#comment:20>
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