Hello all
I've been using the hclust and as.dendrogram objects for hierarchical
clustering. The problem I have is that my sample set is now so large (circa
500 points) that it isn't possible to view the leaf nodes.
I'd like to be able to zoom in on specific areas of the graph by selecting
a
region with the mouse. I've deduced from trial and error that the xlim and
ylim parameters don't work with these plots and the only method I've had
any
success with is to cut the tree at a specific point and display the lower
region. However, the cut function returns a list of all subtrees below the
specified height and I have no way of selecting a particular subtree (that
is, cutting on the x-axis).
The identify and rect.hclust functions seem to do this OK and in fact
these
partially solve my problem but I want to use getGraphicsEvent() if possible
since this also allows interaction with the keyboard (so that I can use the
backspace key for example to return to the previous plot). I'm fairly new
to
R so may be wrong but it appears that the plots are single threaded and can
respond to either a set of graphics events or an identify loop but not
both)
It has been suggested that I look at Graphviz since this has more
comprehensive mapping facilities. Is this likely to help? Is there for
example a method for converting an R hclust object to an Graphviz ICLUST or
some alternative method for describing an hclust in the Graphviz .DOT
notation?
Or can anybody suggest an alternative approach ??
Regards
Mark
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