#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:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | 059b6d3816eae7412bc5e6570c17888fa2b75678
public/ticket/14666 | Stopgaps:
Dependencies: |
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Comment (by darij):
Also, I'm not fully sure about what goes on here:
{{{
if weights is None:
for e in Y:
res.append(e)
if self._rank(res) > r:
r += 1
else:
del res[-1]
smres.append(e)
if self._rank(smres) >= 1:
return False
else:
del smres[-1]
return True
}}}
Am I seeing it right that `smres` never has length >1 ? So you are
essentially checking that `e` is a loop; if it isn't, then you return
`False`? Do you really need an array for that?
--
Ticket URL: <http://trac.sagemath.org/ticket/14666#comment:15>
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