[R] multiv{pca} question

Prof Brian Ripley ripley at stats.ox.ac.uk
Mon Jun 14 08:25:15 CEST 2004

Why are you using the OPRHANED multiv library for a facility covered by 
princomp() and prcomp() in base R?  The list might be able to help you 
with the latter, but no one is supporting multiv (hence its status).

On Sun, 13 Jun 2004, Scott Robbins Loarie wrote:

> I am having trouble using the pca function in the multiv library.
> I am trying to generate the values found in $rproj by using $evecs to
> calculate linear combinations of my input data.  However, I have been not
> been able to correctly calculate the $rproj values.
> Using the following standard sample data, why does iris%*%pcprim$evecs[,]
> not equal pcprim$rproj?
> data(iris)
> iris<-as.matrix(iris[,1:4])
> pcprim<-pca(iris)

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

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