#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 tara):
Replying to [comment:24 Stefan]:
>
> I see it. The problem is that the user input variable "weights" is used
down the line, as opposed to the object created in the try/except blocks.
The list `wt` is not so useful, so I would probably define something
that's guaranteed to be a function, like so:
>
> {{{
> if callable(weights):
> wts = weights
> else:
> wts = lambda x: weights[x]
> }}}
> Then use wts instead of weights down the line.
>
The reason that `wt` is currently useful, is that it is used to sort the
elements in decreasing order of weight. I'm not sure how to do that with
only a function `wts`. I tried adding the function wts, but I ended up
having it not compile. I'll look at it again tomorrow.
--
Ticket URL: <http://trac.sagemath.org/ticket/14666#comment:25>
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