[R] dendrogram

[Zhesi He]

Dear list,

Sorry if my question is too easy.
I now have a class list like

1.01.01.01
1.01.01.02
1.02.01.01
1.03.01.01
...
9.09.09

I have no problem transferring it to a matrix without those zeros. But 
I really want to have a dengrogram class object so that I can have a 
hierarchical plot.

Also... is there any package that contains interactive dendrogram? for 
example, i can select the levels of cutting the  tree on the plot?
something like that would be useful.

Thanks a lot.

___________________________________________________

Zhesi He
Computational Biology Laboratory, University of York
York YO10 5YW, U.K.
Phone:  +44-(0)1904-328279
Email:  zh107 at york.ac.uk