[GRASS-dev] PCA (i.pca) in G7: filtering and rescaling

Nikos Alexandris nik at nikosalexandris.net
Wed Dec 4 14:46:15 PST 2013

Nikos Alexandris:
> > Here, immediate effect when percent=99.68.  I guess it gets rounded to
> > 99.7 ?

Moritz Lennert:
> Actually, the man page says "percent=integer". The input is treated with
> atoi(). I don't know if that rounds or floors..

Heck, overlooked that :-(.  In my very humble and ever-wannabe-scientist 
opinnion, though, we need those extra digits to make it easy rejecting last 
Principal Component(s) prior to the backward PCA. Might be one, two or 
numerous (?) depending on the dimensions.


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