#14666: Test if a weight function is generic for a given matroid
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Reporter: Stefan | Owner: Stefanf
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-7.2
Component: matroid theory | Resolution:
Keywords: matroid, weight | Merged in:
function | Reviewers: Darij Grinberg
Authors: Tara Fife | Work issues:
Report Upstream: N/A | Commit:
Branch: | 4031e326dcdf7a40072483267f45362bf2f88709
public/ticket/14666 | Stopgaps:
Dependencies: |
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Comment (by tara):
The only thing that looks like a problem is in edb1a33, you changed `wt =
sorted(wt, reverse=True)` to `wt = sorted(wt)` in line 6667. And later
changed `if wt_dic[e] < wt_dic[res[-1]]:` to `if wt_dic[e] >
wt_dic[res[-1]]:`. It seems like this would test if a minimum cobasis was
generic rather than a maximum cobasis. I would expect
`M.is_max_weight_coindependent_generic()` to give the same results as
`M*.is_max_weight_independent_generic()`, where `M*` is the dual of `M`.
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Ticket URL: <http://trac.sagemath.org/ticket/14666#comment:41>
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