#8284: IntervalGraph generator and a bug in is_chordal
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Reporter: ncohen | Owner: ncohen
Type: defect | Status: positive_review
Priority: critical | Milestone: sage-4.4.4
Component: graph theory | Keywords:
Author: Nathann Cohen | Upstream: N/A
Reviewer: Robert Miller | Merged:
Work_issues: |
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Comment(by ncohen):
you are right !!! I think the best way would be to create a RealInterval
class in sage.sets, this way each vertex would be an immutable (hashable)
object, and the graph could have two vertices representing the same
interval.. I had the same problem when writing the recognition algorithm
(#7563) : twin vertices were representing the same intervals, and the
final graph was not isomorphic to the first as some vertices had
disappeared..
I used a small trick to make it work, but this is definitely not a good
answer :-)
Nathann
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8284#comment:13>
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