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MathGroup Archive 2005

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Re: Directed Graph from Adjacency Matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58817] Re: [mg58783] Directed Graph from Adjacency Matrix
  • From: Ian Roberts <mathgroup at quantica.com.au>
  • Date: Tue, 19 Jul 2005 04:10:40 -0400 (EDT)
  • References: <200507180721.DAA23417@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Very odd as the inbuilt function  GraphPlot[{{0, 1, 0}, {0, 0, 1}, {1, 
0, 0}}, EdgeStyleFunction -> Automatic] produces a cycle as you would 
expect. ShowGraph[Cycle[3, Type -> Directed]] produces the same graph 
and ToAdjacencyMatrix[Cycle[3, Type -> Directed]] produces your matrix. 
Looks like FromAdjacencyMatrix has a problem as, in the resulting graph, 
the edge between vertices 2 to 3 is missing from the Graph function's 
edge list.
Ian

confused wrote:

>I am new to Mathematica.  Here is my question.  How would I get a 
>directed graph from an adjacency matrix?  For instance, the 3x3 matrix 
>{{0,1,0},{0,0,1},{1,0,0}} defines a directed 3-cycle, but when I try to 
>turn it into a graph using FromAdjacencyMatrix, Mathematica returns a 
>graph with only two edges.
>
>Thank you.
>
>
>
>
>  
>


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