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I have the following problem: I used GraphPlot to plot my adjacency matrix. I divided my nodes in three groups: A = {...}, B={...} and C={...}. I would like to color the nodes conditioning on them belonging to group A (Blue), B (Red), C (Grey). How do I do that?

Example: I have $12$ nodes distributed in three groups as follows: $ A=\{1,4,5,8\}, B=\{2,3,6,7,9,10\},C=\{11,12\}$. I want to color the nodes in $A$ blue, the ones in $B$ red and the ones in $C$ grey. I have of course a $12$x$12$ adjacency matrix $M$ and I use GraphPlot[M] to plot the graph. Thank you.

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Please include an example – R. M. Oct 3 '13 at 20:39
@rm-rf I have just added an example, thank you! – Friedrich Nietzsche Oct 3 '13 at 20:46
Please look up HighlightGraph and use Graph instead of GraphPlot. There's no built-in function named PlotGraph. If you meant GraphPlot, please make sure that you are precise and you type the correct names in this question. This makes the difference between a working and a non-working command. – Szabolcs Oct 3 '13 at 20:55
up vote 3 down vote accepted

Using the notation Pinguin Dirk you could also use VertexStyle in AdjacencyGraph

aa = {1, 4, 5, 8}; bb = {2, 3, 6, 7, 9, 10}; cc = {11, 12};
vs = Join @@ 
   MapThread[Thread[#1 -> #2] &, {{aa, bb, cc}, {Blue, Red, Gray}}];
mm = RandomChoice[{0, 1}, {12, 12}];
AdjacencyGraph[mm, VertexSize -> 0.4, VertexStyle -> vs]

enter image description here


If GraphPlot is what is desired then:

 VertexRenderingFunction -> ({#2 /. vs, Disk[#1, 0.1]} &)]
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Let's say you have some random matrix, such as:

mm = RandomChoice[{0, 1}, {12, 12}];

and the lists

aa = {1, 4, 5, 8}; bb = {2, 3, 6, 7, 9, 10}; cc = {11, 12};

Now, GraphPlot can be used to plot an adjacency matrix, (docu: GraphPlot[m] generates a plot of the graph represented by the adjacency matrix m.)

Thus, using in particular, VertexRenderingFunction, we can do:

GraphPlot[mm, ImageSize -> Large, 
     VertexRenderingFunction -> (Text[
         Background -> 
               MemberQ[aa, #2], LightRed, 
               MemberQ[bb, #2], LightBlue, 
               MemberQ[cc, #2], LightGray, 
               True, Pink]], #1] &)]

I chose LightRed etc for better readability. Obviously, lot's of formatting can be done from this point to make it look nice.

enter image description here

(a small aside: try not to use single letter upper-case names for variables. E.g. C is already taken by the system)

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