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Re: A Question about adjacency matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg104524] Re: A Question about adjacency matrix
  • From: dh <dh at metrohm.com>
  • Date: Tue, 3 Nov 2009 02:53:11 -0500 (EST)
  • References: <hcl4be$c4d$1@smc.vnet.net>


Hi,

Graphics3D is a geometric object. A graph on the other hand is a data 

structure (look up Graph in the help) describing connections (without a 

fixed geometry).

AdjacencyMatrix[g] takes a graph object, not a 3D graphics.

e.g.:

Needs["Combinatorica`"]

Needs["GraphUtilities`"]

g = RandomGraph[4, 0.5, Directed];

ShowGraph[g, VertexNumber -> True]

AdjacencyMatrix[g] // MatrixForm



Daniel





Marwa Abd El-Wahaab wrote:

> Dear Sir,

> 

> I am a teaching assistant in Faculty of Engineering in Mansoura University

> Egypt.

> 

> I am a Mathematica 7  user from about 4 months .

> 

> I have a problem about the construction of adjacency matrix .

> 

> My problem :

> 

> I construct a graph by "Graphics3D" function & I need to get the adjacency

> matrix to this graph .

> 

> I tried  this :

> 

> Needs["Combinatorica`"]

> ToAdjacencyMatrix[graph]

> 

> but it doesn't give me the matrix.

> 

> What should I do?

> 

> I need your help.

> 

> Thanks

> 

> Marwa Ali

> 

> 




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