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## Re: [igraph] an igraph isomorphism problem

 From: Gábor Csárdi Subject: Re: [igraph] an igraph isomorphism problem Date: Wed, 21 Aug 2013 22:14:21 -0400

igraph ignores multiple and loop edges when it does the isomorphism calculations.

Gabor

On Wed, Aug 21, 2013 at 8:45 PM, zhouda wrote:
Hello, I came across a problem when I was trying to get the isomorphism of two graphs.
Here's the python-igraph code:
--------------------------------------------
import igraph
g1=igraph.Graph([(0,1),(1,0),(0,0),(1,1)],directed=True)
g2=igraph.Graph([(0,1),(1,0),(0,1),(1,0)],directed=True)
print g1.isomorphic_vf2(g2)
---------------------------------------------
the result is "True". But I think it should be 'False', and Mathematica and NetworkX both give the "False" result. A similar thing happened when I was trying to calculate the isomorphism of these following two graphs:
---------------------------------------------
g3=igraph.Graph([(0,1),(1,2),(2,0),(0,3),(3,0),(0,0),(3,3)],directed=True)
g4=igraph.Graph([(0,1),(1,2),(2,0),(0,3),(3,0),(0,3),(3,0)],directed=True)
---------------------------------------------

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Interdisciplinary Center for Theoretical Study (ICTS)

University of Science and Technology of China (USTC)

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