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MathGroup Archive 2007

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Re: label graph vertices

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74825] Re: label graph vertices
  • From: "Dana DeLouis" <dana.del at gmail.com>
  • Date: Fri, 6 Apr 2007 04:27:23 -0400 (EDT)

> ..everything is done using an adjacency matrix composed of (0,1)'s

If you are working with an AdjacencyMatrix, here's an additional idea using
Combinatorica.

Needs["DiscreteMath`Combinatorica`"]

am = {{0, 0, 1, 0, 0, 1, 1}, 
    {0, 0, 0, 0, 1, 1, 1}, 
    {1, 0, 0, 1, 1, 1, 1}, 
    {0, 0, 1, 0, 1, 0, 1}, 
    {0, 1, 1, 1, 0, 1, 0}, 
    {1, 1, 1, 0, 1, 0, 0}, 
    {1, 1, 1, 1, 0, 0, 0}}; 

MatrixForm[am]

(* Your Labels here as a list *)
Lbls = CharacterRange["A", "G"]; 

g = SetVertexLabels[FromAdjacencyMatrix[am], Lbls]; 

ShowGraph[g];

-- 
HTH   :>)
Dana DeLouis
Windows XP & Mathematica 5.2


<alexxx.magni at gmail.com> wrote in message news:ett7ks$id6$1 at smc.vnet.net...
> greetings,
> after having used for some time a very powerful program (Graphviz) for 
> displaying the graph structures I'm working on, I decided to give it a 
> try under Mathematica, since I use M. for many other related tasks.
> 
> I started from DiscreteMath`GraphPlot`, but from what I can see 
> everything is done using an adjacency matrix composed of (0,1)'s, 
> right?
> That is, my problem is that I need to LABEL the vertices with a name, 
> instead of a position.
>>From 
>>http://documents.wolfram.com/mathematica/functions/AdvancedDocumentati
>>onGraphPlot
> I thought for a moment it was possible (e.g. see graph under 
> "MaximalBipartiteMatching" with Tom,Rob,Adam etc), but I then realized 
> it was demonstration-only, and no code is present to do it
> 
> am I right, or there is a way?
> 
> thanks for any help...
> 
> Alessandro Magni




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