[Gretl-users] PCA score calculation

Dear all, many thanks for accepting me in this thread. I have been a student user of Grelt and now trying to grab it again for PCA modelling in my current work. I tried to replicate the score calculation as provided by Gretl (PC1, PC2 etc vectors that you can store and save after running the PCA command) but i cannot seem to derive those as simply: PC Factors = Eigenvectors * standardized original variables (x - mean). Where am i making a mistake? Thanks for all your wonderful contribution, Best Francesco