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MathGroup Archive 2005

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Re: A very EZ Question! Make a Graph!

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60290] Re: A very EZ Question! Make a Graph!
  • From: "mumat" <csarami at gmail.com>
  • Date: Sat, 10 Sep 2005 06:46:39 -0400 (EDT)
  • References: <dfrgc5$fpf$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Dear Bob Thanks for the solution!

Now after you make the graph! I ask for the list of vertices of the
graph you made for me! I get

{{0.309017,0.951057},{-0.809017,0.587785},{-0.809017,-0.587785},{0.309017,-0.951057},{1.,0}}



while it must return {1,2,3,4,5}!!! the same for the edge set of the
graph!



regards,

chekad









On 9/9/05, Bob Hanlon <hanlonr at cox.net> wrote:
Needs["DiscreteMath`Combinatorica`"];

e={{1,2},{2,3},{4,5},{1,4},{2,5}};

am=Table[0,{5},{5}];

ReleaseHold[HoldForm[
         am[[Sequence@@#]]=
           am[[Sequence@@Reverse[#]]]=1]&/@e];

ShowLabeledGraph[g=FromAdjacencyMatrix[am]];

Position[#,1]&/@ToAdjacencyMatrix[g]

{{{2}, {4}}, {{1}, {3}, {5}}, {{2}}, {{1}, {5}}, {{2}, {4}}}


Bob Hanlon

>
> From: "mumat" <csarami at gmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/09/09 Fri AM 04:07:01 EDT
> Subject: [mg60290] [mg60262] A very EZ Question! Make a Graph!
>
> Hi Everybody,
>
> I need to make a graph given the vertices and edges.
>
> let's say:
>
> Vertex set: V=Range[5]={1,2,3,4,5}
> Edge Set:   E={{1,2},{2,3},{4,5},{1,4},{2,5}};
>
> Also, Is there any funtion that Lists the vertices adjacent to a given
> vertex! I mean using the Combinatorica package in Mathematica!
>
>
> I know it might sound stupid, but I could find a solution to this in
> Mathematica Manual!!!
>
> I appreciate your help.
>
> regards,
>
> chekad
>
>


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