[R] plotting dendrograms from cluster analyses

[Philippe Grosjean]

Under Windows 2000 (since you are using this environment), some printer
drivers have options for "poster printing". For instance, with the later
driver of the HP Deskjet 990cxi, you can print in up to 4x4 sheets of paper.
This could be an easy solution to your problem. Just select the desired
options in the printer driver. If your printer driver doesn't exhibit such
features, you still can save a metafile version of your graph and import it
in a vector drawing program that offer this possibility, like Corel Draw (I
think this option exists since version 5 or 6). I don't believe this should
be a feature included in R. It is really a printer driver job!

Also, (I haven't looked at it) but there is a package "pinktoe" in CRAN that
convert a tree into a serie of html objects you can transverse interactively
in a web browser. This could be another convenient solution to explore your
very large tree.

Best regards,

Philippe Grosjean


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>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

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