Hi R hep group member, I want to know that how I can call my data in R for princomp function. I want to calculate PCA of 200 descriptors of 4000 molecule(I am using Linux). How I can call this in R. Thanking you. -- Nitish Kumar Mishra Junior Research Fellow BIC, IMTECH, Chandigarh, India E-Mail Address: nitish_km at yahoo.com nitish at imtech.res.in