community finding in a graph and heatplot

Hi everyone,

I am using the fastgreedy.community function to get the $merges matrix and the $modularity vector. This serves my purpose of testing modularity of my graph. But I am "greedy" to plot the heat map and dendrrogram based on the $merges dendogram matrix. I know that heatplot does the graphics part but I am not sure if the dendogram generated by the heatplot will match the one given by fastgreedy.community in all cases and that the heat map will represent the same clustering.

Tell me if my apprehension is incorrect. Otherwise please let me know of any alternatives. Here is the code I am testing so far:

# http://igraph.sourceforge.net/doc/R/modularity.html
# http://igraph.sourceforge.net/doc/R/fastgreedy.community.html
# http://igraph.sourceforge.net/doc/R/graph.constructors.html

library(igraph)
library(made4)

g <- graph(c(1,2, 2,3, 3,1, 4,5)-1, , FALSE)
print(g)
ModuleInfo <- fastgreedy.community(g)
print(ModuleInfo)
heatplot(c(1,2, 2,3, 3,1, 4,5))


Thanks
Fayez
Grad student UIUC
IL, USA

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