MathGroup Archive: September 2011 [00448]

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GraphPlot bug? (missing self-loop)

To: mathgroup at smc.vnet.net
Subject: [mg121613] GraphPlot bug? (missing self-loop)
From: Alan <alan.isaac at gmail.com>
Date: Thu, 22 Sep 2011 07:25:56 -0400 (EDT)
Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Reply-to: comp.soft-sys.math.mathematica at googlegroups.com

How can I display self-loops using GraphPlot when the input is an adjacency matrix?

GraphPlot[{a -> a, a -> b}, DirectedEdges -> True] (* displays self-loop *)
GraphPlot[{{1, 1}, {0, 0}}, DirectedEdges -> True] (* missing self-loop *)

GraphPlot gives similarly surprising results when the input is a graph:

g = Graph[{a -> a, a -> b}, DirectedEdges -> True] (* displays self loop *)
GraphPlot[g, DirectedEdges -> True] (* missing self loop *)

Thanks,
Alan Isaac

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