Hi everyone,
I'd like to project two pcas onto one device window.  
 
I plot my first PCA:
biplot(prcomp(t(cerebdevmat)), var.axes=FALSE, cex=c(1,.1),
pc.biplot=TRUE)
 
Now I'd like to project the features of another PCA onto this graph.
 
Any suggestions?
 
I know this is easily done in MatLab but haven't figured it out in R.
 
Thanks,
Tanya

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