R help - Sep 2003 - Loading Distance matrices and PCA

Hi All

I am really new into R, and I would like to know if it is possible to load a
distance file matrix (lower-triangular) into R and then do a PCA or
Multidimensional Scaling over that matrix.

I would apreciate any help,
Thanks

Diego Riano

-- 

Diego Mauricio Riano Pachon
Biologist
Institute of Biology and Biochemistry
University of Potsdam
Karl-Liebknecht-Str. 24-25
Haus 20
14476 Golm
Germany
Tel:0331/977-2809
http://bioinf.ibun.unal.edu.co/~gotem
http://www.geocities.com/dmrp.geo/

On Thu, 11 Sep 2003 diriano at rz.uni-potsdam.de wrote:
> I am really new into R, and I would like to know if it is possible to load
a
> distance file matrix (lower-triangular) into R and then do a PCA or
> Multidimensional Scaling over that matrix.
No, yes, as PCA is not defined for a distance matrix but MDS is.

-- 
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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595