On Tue, 24 Feb 2009, Axel Strauß wrote:
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.
That's not part of the design of the function, so just make a copy and edit to meet your fancies.
The designer of biplot.princomp.
Tipps? Thanks again, AxelDear 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 archivehttp://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
-- Brian D. Ripley, rip...@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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