>>>>> Greg Snow <538...@gmail.com>
>>>>> on Mon, 27 Oct 2014 12:33:18 -0600 writes:
> I don't know of any tools that automate this process. For small
> sample sizes it may be easiest to just do this by hand, for large
> sample sizes that plot will probably be to complicated to make sense
> of. There may be a range of moderate sample sizes for which
> automation (or partial automation) would be helpful. The hclust
> object has a component of "height" which is an indicator of the
> distance between 2 components being combined into a cluster, you could
> convert this into a distance matrix
it has been known for many years how to do this; still, I have
only learned about it from Robert Gentleman (yes, one of the two
fathers of R), when we added the function
cophenetic()
to R
which does exactly do this:
Provide the distance matrix which is implicitly defined by a
hierarchical clustering.
Martin Maechler, ETH Zurich
> (or extract the distance matrix used to do the clustering
> if it is available) and then use multidimensional scaling
> (cmdscale function is one option) to produce a 2
> dimensional set of points. Drawing the
> circles/ellipses/ovals will be more difficult, possibly
> generate a cloud of normal points, or a small circle,
> around each point with the variability/radius low enough
> that the clouds are unlikely to overlap, then find the
> convex hull (chull function) for the points within a
> cluster and draw that (it will be a polygon rather than a
> smooth curve). The gBuffer command in the rgeos package
> may be another way to create polygons around the points in
> a group.
> On Mon, Oct 27, 2014 at 5:42 AM, David Feitosa <davidfeit...@gmail.com>
wrote:
>> Hello!
>>
>> I have a code that creates an hclust object.
>> After the object creation I plot the object as a dendrogram,
>> similar to the left image of this link:
>>
>> http://www.cs.jhu.edu/~razvanm/fs-expedition/hclust-example.png
>>
>> I would like to create another image, but similar to the right,
>> as a set of nested dots and elipses/circles.
>>
>> Anybody knows how to do this?
>>
>> Thanks in advance.
>>
>> David Feitosa
>>
>> (\_(\
>> (=°;°)
>> (("")("")
>>
>> [[alternative HTML version deleted]]
>>
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> --
> Gregory (Greg) L. Snow Ph.D.
> 538...@gmail.com
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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