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Re: Re: Directed Graph from Adjacency Matrix


I think that  FromAdjacencyMatrix[{{0, 1, 0}, {0, 0, 1}, {1, 0, 0}}] 
should produce a Graph object with 3 correctly ordered pairs of vertices 
in it. It only contains the first 2. Adding Type->Directed should only 
order the pairs if needed and add  the arrows via Rule[EdgeDirection, 
True]. Interestingly, FromAdjacencyMatrix[{{0, 1, 0}, {0, 0, 1}, {0, 0, 
1}}] does produce the corresponding pairs of vertices.
Note that the inbuilt function works OK ie GraphPlot[{{0, 1, 0}, {0, 0, 
1}, {1, 0, 0}}] or GraphPlot[{{0, 1, 0}, {0, 0, 1}, {1, 0, 0}}, 
EdgeStyleFunction -> Automatic] if you want the arrows.
Ian

Carl K. Woll wrote:

>"confused" <gtg368j at mail.gatech.edu> wrote in message 
>news:dbflj5$n0m$1 at smc.vnet.net...
>  
>
>>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.
>>
>>    
>>
>
>Use the option Type->Directed:
>
>ShowGraph[FromAdjacencyMatrix[{{0,1,0},{0,0,1},{1,0,0}},Type->Directed]]
>
>produces a directed 3-cycle.
>
>Carl Woll
>Wolfram Research 
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