[R] biplot.princomp - changing score labels

[Axel Strauß]

OK, the one thing I figured out:
Is should be like:
biplot(test.pca, cex=c(2,1), col=c("red","green")...
to change size, colours etc separately. But I still don't know how 
change lables of observations to symbols properly.

Tipps? Thanks again,
Axel
> Dear R helpers,
>
> When producing a PCA biplot, vectors of environmental variables (as 
> red arrows with labels) and scores of the observations (black labels 
> (observation names)) are plotted by default. How can I change the 
> graphical output? Let's say I would like that the scores are plottet 
> only as symbols and not text. The only solution I found was this post 
> in the help archive
> http://tolstoy.newcastle.edu.au/R/e2/help/06/12/7298.html
> suggesting "cheating" like:
> >biplot(test.pca, xlabs=c("0","0","0","0","0","0...
> and using letters instead of symbols.
> This works somehow, but I am still not able the change e.g. the colour 
> or size of only the scores. Whatever I try to do with "col=...", 
> "cex=..." and so on changes either all labels in the plot or none. Can 
> someone tell me what is the trick to only modify either the 
> environmental variables or the scores? Also e.g. the type of the arrow?
>
> Thanks in advance,
> Axel
>
>
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