[R] Principle component analysis

[phthao05]

Thanks to Mr.Liviu Androvic and Mr.Richard Rowe helped me in PCA. 
Because I have just learn R language in a few day so I have many problem. 
1) I don't know why PCA rotation function not run although I try many times.
Would you please hepl me and explain how to read the PCA map (both of
rotated and unrotated) in a concrete example. 
2) Where I can find document relate: Plan S(A), S(A*B), S(A)*B?
       Thanks alot.
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