#19520: implement random triangulations in a bijective way
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Reporter: | Owner:
chapoton | Status: needs_review
Type: | Milestone: sage-6.10
enhancement | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers: Nathann Cohen
theory | Work issues:
Keywords: | Commit:
random graph | 72dd8ddead628d7a383f88038bfe781b1e7ad520
Authors: | Stopgaps:
Frédéric Chapoton |
Report Upstream: N/A |
Branch: |
public/19520 |
Dependencies: |
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Comment (by ncohen):
Helloooooo Frédéric,
Thanks, this code is a bit easier to understand (and I almost get what it
does)!
I admit that I am still looking with longing at the
`rotate_l_to_next_pattern` function I gave in an earlier comment hoping
that it could fit, but so far I have a couple of questions left:
1) It seems that you consider the word as a circular word, but I am not
convinced that your code would notice the pattern 'in,in,in,lf' if it
appeared 'wrapped around' in this way: 'lf,in,in,in,in,in,in'. Is that
correct? My previous code was written to handle this situation.
2) I do not understand the purpose of the second condition in `if not
stack_in or (x != stack_in[-1]):`. I thought you were only looking for the
pattern 'in,in,in,lf' but it seems that some additional constraint has to
be added?
Also, could you add a check at the end of your function that the graph you
return has the expected number of edges (as it is a planar triangulation)?
Thanks,
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/19520#comment:40>
Sage <http://www.sagemath.org>
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