[R-sig-Geo] how to do a principle component analysis with geo-referenced points

[piero campa]

I wish I could do that, but the documentation seems to lack this level of
detail:

>?prcomp
     [...]
     ‘prcomp’ returns a list with class ‘"prcomp"’ containing the
     following components:
     [...]
       x: if ‘retx’ is true the value of the rotated data (the centred
          (and scaled if requested) data multiplied by the ‘rotation’
          matrix) is returned.  Hence, ‘cov(x)’ is the diagonal matrix
          ‘diag(sdev^2)’.  For the formula method, ‘napredict()’ is
          applied to handle the treatment of values omitted by the
          ‘na.action’.
     [...]

Here it seems to describe the x scores but not their dimnames.  ..?
Cheers,
Piero
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