#14536: Random tournaments, a misnamed method and a segfault
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Reporter: ncohen | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.10
Component: graph theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Nathann Cohen | Merged in:
Dependencies: #14475 | Stopgaps:
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Comment (by nthiery):
Replying to [comment:3 ncohen]:
> If the number of vertices is included in the name, you get "Transitive
Tournament on 5 vertices: Digraph on 5 vertices".
I see. It would be consistent to fix Circuit then:
{{{
sage: digraphs.Circuit(5)
Circuit on 5 vertices: Digraph on 5 vertices
}}}
But that can be for later.
> Hey, it's not a Poset ! It's a digraph !
Fair enough :-)
> Well, you are right a large part of it could be made automatic. It would
also be the occasion to create a Nauty module, and so a documentation page
about the Nauty spkg (how it is to be installed, which Demigod first wrote
it.
>
> Let's say another patch ?
Yup.
> Nauty is not a part of Sage because of license problems...
I know. Maybe we should chat to Brendan about this someday.
> And it knows how to enumerate things that are not implemented in Sage
yet (like hypergraphs `:-PPP`).
>
> It goes in both directions, though. It is easy to enumerate through
> Sage the list of graphs satisfying some specific property, and the
> property is actually tested *during* the enumeration. No way to do
> this with Nauty, unless we *REALLY* rewrite the interface and call
> Nauty's C functions directly `:-P`
Yup. Still it would be nice if there was a single entry point for
both generators, even if some features only work in one case.
Cheers,
Nicolas
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14536#comment:4>
Sage <http://www.sagemath.org>
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