<t>My humble understanding:PCA is just a linear transformation (more exactly, a linear projection); basically, it could be use to map from, say, 5 dimensions space (A,B,C,D,E) to a new set of variables (a new space) , say (X, Y) where: X =f(A,B,C,D,E) & Y= g((A,B,C,D,E).thus, you need to underst...