[R] hclust question
Prof Brian D Ripley
ripley at stats.ox.ac.uk
Fri Feb 23 08:22:43 CET 2001
On Thu, 22 Feb 2001, Ranjan Maitra wrote:
> Dear all,
> I have a question with regard to the use of hclust. I would like to be
> able to specify my own distance matrix instead of asking R to compute
> the distance matrix for me. It is computationally easier for me this
> way. My question is: How can I get hclust to accept this?
I am puzzled:
d: a dissimilarity structure as produced by `dist'.
So hclust accepts a dissimilarity matrix as its first argument, and does
not compute a distance matrix.
Just supply `d'. The `Value' section of ?dist tells you how to specify it.
For hclust only the `Size' and `Labels' attributes are needed, I believe.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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