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Label vertices in Graph to display with GraphPlot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87213] Label vertices in Graph to display with GraphPlot
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Fri, 4 Apr 2008 02:58:28 -0500 (EST)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • Reply-to: murray at math.umass.edu

I'm using some Combinatorica functions to create graphs where I do not 
specify individually the vertices -- and hence do not individually 
specify the vertex labels I want, e.g.:

   g = RotateVertices[Cycle[5], \[Pi]/10]; g = AddEdge[g, {2, 5}];
   g = SetGraphOptions[g, VertexLabel -> Characters["abcde"]];

If I use Combinatorica`ShowGraph, then I'll see the vertex labels:

   ShowGraph[g]

However, if I use Mathematica 6's kernel function GraphPlot, I don't see 
these individual labels, but rather the entire list {a,b,c,d,e} of 
labels at each vertex!

   GraphPlot[g,Method->None,VertexRenderingFunction->(Text[#2,#1]&)

How do I coerce GraphPlot to reproduce the behavior of ShowGraph, so 
that it labels the individual vertices with a, b, c, d, e?

(The interaction between Combintorica's graph-creating functions, on the 
one hand, and GraphPlot, on the other hand, remains mysterious and 
severely underdocumented for me.

It seems there's a clear attempt to migrate display of graphs to the 
kernel function GraphPlot and thereby discourage use of ShowGraph, yet 
in almost everything I've attempted so far, GraphPlot does not so 
readily or gracefully reproduce the functionality of Combinatorica'a 
ShowGraph.  This is most especially the case as it affects relative 
newcomers to Mathematica like my students.)
-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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