[R] plotting dendrograms from cluster analyses

[fharrell@virginia.edu]

This may not be a solution to your problem but I think
it would be worthwhile to develop a dendogram graphics
driver that uses AT&T's graphviz package, which has its
only command language and produces very detailed directed
and undirected graphs.  You can find graphviz at
http://www.research.att.com/sw/tools/graphviz

The manuals for the programs that make up graphviz have
many nice examples.

Frank Harrell


Duncan Mackay wrote:
> 
> Hi all,
> I have a bit of a newbie question here that I hope y'all can help with. I've
> run a cluster analysis using hclust on about 500 objects (using R1.3 under
> Win 2000). The problem is that the tips of the dendrogram are so close
> together on the plot that the labels overlap and are unreadable. I've used
> "cex" to reduce the label sizes but this isn't sufficient with so many
> objects on the plot. I've looked at "cutree" but this seems to show a
> summary of the upper levels of the dendrogram (?) and I want to see the
> details at the bottom. Basically I just want to print the dendrogram over
> several pages so that the plot is stetched out horizontally and the tip
> labels become readable. Is that possible? More generally, how does one print
> out large plots over several pages?? Can that be done?
> Many thanks for any help,
> Duncan
> 
> *******************************************
> Dr. Duncan Mackay
> Biology
> Flinders University
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-- 
Frank E Harrell Jr              Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine  http://hesweb1.med.virginia.edu/biostat
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