PCA_MAT - Principal Component Analysis with MATLAB (svds)
    [U, S, V]=PCA_MAT(A, C, K) computes the K-factor Principal 
    Component Analysis of A, i.e. SVD of A-C*ones(size(A, 2), 
    1), using the svds function of MATLAB.
 
  Copyright 2011 Dimitrios Zeimpekis, Eugenia Maria Kontopoulou, 
                 Efstratios Gallopoulos