[R] principal component analysis for class variables

[andreiabb]

Dear Forum,

I have a class variable 1 (populations A-E), and two other class variables,
variable 2 and variable 3. What I want is to see if the combination of var 2
and var 3, will give me a pattern that allows to distinguish populations. 
I found several packages like ade4, with pcaiv function and factoMineR. but
there are not working. Using the ade4 package, when I try to build the pca:
 pca1 <- dudi.pca(D, scan = FALSE, nf = 2)
Error in v * row.w : non-numeric argument to binary operator

Does someone has suggestions? 
Thanks,
Andy
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