#13961: Compute the root graph of a graph (inverse of Graph.line_graph)
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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: #13787 | Stopgaps:
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Comment (by dcoudert):
I tried with sage 5.9-beta5 and got a segfault. I will forward you by mail
the log message (in case it could be useful).
{{{
sage: G = graphs.CompleteGraph(10)
sage: G2 = G.line_graph()
sage: G3 = G2.line_graph()
sage: G4 = G3.line_graph()
sage: G;G2;G3;G4
Complete graph: Graph on 10 vertices
Graph on 45 vertices
Graph on 360 vertices
Graph on 5400 vertices
sage: G.is_isomorphic( root_graph( root_graph( G3 )[0] )[0] )
True
sage: H = root_graph(G4)
.... segfault
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13961#comment:9>
Sage <http://www.sagemath.org>
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