Thanks a lot. I have just test it and... it works! :-) 
  J.

Martin Maechler <maechler@stat.math.ethz.ch> wrote:
  >>>>> "Julio" == Julio Thomas 
>>>>> on Fri, 9 Dec 2005 21:13:20 +0000 (GMT) writes:

Julio> Dear R-helpers, Is there somebody who knows if R has
Julio> already a build in function for Hierarchical
Julio> Clustering which uses Mutual Information as proximity
Julio> measure?

The most prominent hiearchical clustering functions in R,
hclust() and agnes() and diana() {package 'cluster'}, are based
on general dissimilarity "matrices";

so you just need to be able compute 
d(i,j) <- Mutual_Information( unit[i], unit[j] )
and then use for example hclust().

If 'MI' was a matrix with these numbers, you'd use

dMI <- as.dist(MI)
hc.res <- hclust(dMI, ....)

plot(hc.res, .....)
....

Martin Maechler, ETH Zurich

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