[R] plotting other axes for PCA

[Silvia Lomascolo]

Hi R-community,
I am doing a PCA and I need plots for different combinations of axes (e.g.,
PC1 vs PC3, and PC2 vs PC3) with the arrows indicating the loadings of each
variables.  What I need is exactly what I get using biplot (pca.object) but
for other axes.

I have plotted PC2 and 3 using the scores of the cases, but I don't get the
arrows proportional to the loadings of each variables on each axis.

Any hints on this?

Thanks, Silvia.
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