Hi folks,
I received the following bug report via IRC:
07:54 < quimey> I am using the poset class
07:55 < quimey> there is a method, for a poset P, in order to see the poset you
can execute P.show
07:55 < quimey> That shows a graph describing the poset
07:56 < quimey> in some cases three vertices of the graph are aligned
07:56 < quimey> and the edges connecting it are overlapped
07:56 < quimey> I have an example if you want
07:57 < mvngu> Sure. Please paste the example code to http://dpaste.com
08:02 < quimey> http://dpaste.com/149055/
08:03 < quimey> the edge connecting 4 and 5 is overlapped with the edge
connecting 2 and 5
The relevant code sample is
[mv...@sage mvngu]$ sage
----------------------------------------------------------------------
| Sage Version 4.3.1, Release Date: 2010-01-20 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: def CoverRelationSubp(P,e):
....: lista = P.cover_relations()
....: print lista,e,e in lista
....: lista.remove(e)
....: return Poset((P.list(),lista))
....:
sage: P=Poset({0:[2,3], 1:[3,4,5], 2:[5], 3:[5], 4:[5]})
sage: P.show()
sage: print P.cover_relations()
[[1, 4], [1, 3], [4, 5], [0, 2], [0, 3], [2, 5], [3, 5]]
sage: e= P.cover_relations()[0]
sage: D=CoverRelationSubp(P,e)
[[1, 4], [1, 3], [4, 5], [0, 2], [0, 3], [2, 5], [3, 5]] [1, 4] True
sage: print D.cover_relations()
[[4, 5], [0, 2], [0, 3], [2, 5], [1, 3], [3, 5]]
sage: show(D.hasse_diagram())
sage: show(D)
--
Regards
Minh Van Nguyen
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