Dear list, I'm trying to make a biplot, but instead of plotting the row
number for each observation, plot a group factor.
Example:
prcomp(iris[,1:4]) -> PCA
biplot(PCA) #this makes a nice biplot but with row names
Instead of row numbers I want to plot iris[,5], which is a factor.
I can do this:
plot(PCA$x[,1], PCA$x[,2], type="n")
text(PCA$x[,1], PCA$x[,2], labels=iris[,5], col=palette()[iris[,5]])
Here I have a nice colored plot, but without the variable vectors.
Any tip?
Thanks a lot in advance.
Alejo
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