an apparent bug in graphical matroids (graphic_coextension() )

[Dima Pasechnik]

Please see https://trac.sagemath.org/ticket/24512

where we discovered that an innocent change in implementation of a wheel graph G, resulting

in G.edges() and G.edge_iterator() giving different orders, breaks graphic matroid's

graphic_coextension() 

[Stefan van Zwam]

Hi,

It’s not a bug, just a badly written doctest. The Matroid() function tries to guess a mapping from the provided ground set to the edges of the graph. The solution is to have the doctest explicitly label the edges, as I commented on the ticket.

—Stefan.

 

--

---
You received this message because you are subscribed to the Google Groups "sage-matroid" group.
To unsubscribe from this group and stop receiving emails from it, send an email to sage-matroid...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.