Nikos Alexandris wrote:
However, I am still troubled as to why R's prcomp() function gives
different results than it did some months before. I run the scripts I
used before on the same unchanged data and prcomp() gives completely
different numbers.
Ouch!!! Strike that out! I haven't been regularly using GRASS lately and
forgot the MASK! It was the MASK's fault, not mine 
Apologies, Nikos