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MathGroup Archive 2008

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How do I use EdgeRenderingFunction in GraphPlot with one command

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89255] How do I use EdgeRenderingFunction in GraphPlot with one command
  • From: Pavithra Harsha <pavithra at mit.edu>
  • Date: Sun, 1 Jun 2008 16:33:54 -0400 (EDT)

Hi,

I am new to Mathematica and I would like to use GraphPlot for drawing 
graphs. I have a color and a thickness attribute for each edge of the 
graph. I have extended my code from on the posts on thickness 
(http://forums.wolfram.com/mathgroup/archive/2008/Feb/msg00327.html).

So, here is how I modified it. But the problem I have is that the 
attributes are getting matched with the edges in a different order.


Clear[getThickness];
Clear[getColor];
Clear[e];

Array[Freq, 3];
Freq[1] = 0.004; Freq[2] = 0.012; Freq[3] = 0.004;

Array[Color, 3];
Color[1] = Red; Color[2] = Blue; Color[3] = Green;

count = 1;
getThickness[d_] := {getThickness[d] = Freq[count]; count++;}

ColorCount = 1;
getColor[d_] := {getColor[d] = Color[ColorCount]; ColorCount++;}

e = {LGA -> PHX, PHX -> LGA, LGA -> BOS};

g = GraphPlot[e, DirectedEdges -> True, VertexLabeling -> True,
   EdgeRenderingFunction -> ({getColor[#1],
       Thickness[getThickness[#1]], Arrowheads[{{.05, .8}}],
       Arrow[#1]} &)]


Here the order of the edges it takes are 1,3,2 rather than 1,2,3 which is 
the order of the attributes given. This is just a small example but my 
problem has about 900 edges and the order of the attributes gets more 
complicated as one proceeds. Can you please help me how I can modify this. 
Thanks.

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