> I suspect the NAs in the object Apo but however maNormMain is expected to > take care of them, is that right? > (Package: marray, Version: 1.4.9, R 1.9.0) I can't answer your primary question, but I will point out that the current version of marray (as of yesterday's BioC 1.4 release) is 1.5.8, and updating might very well solve your problem. -J