[R] Visualising the effects of PCAs

[Roland Goecke]

Hi,

this may sound like a very stupid question and perhaps it is, so I 
apologise in advance if anyone feels bored by it.

I have done some principal component analysis with prcomp and what I 
would like to do is to visualise the effect of a principal component, 
i.e. show a graph of my data and then show how that graph would change 
if I go, let's say, one standard deviation, in either direction. Kind of 
original graph plus graph with +1 s.d. plus graph with -1 s.d. I know 
how to plot several graphs together but how do I compute the points of 
the graphs with the PC effects in R?

Regards
Roland

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