On Fri, Apr 16, 2010 at 9:36 AM, Mohamed Lajnef <Mohamed.lajnef at inserm.fr> wrote: > Dear R users, > > How can I extract a subset of an MAlist object ? You might try help('02.Classes') in limma. If you have an MAList called ma: ma[1:100,1:10] gives a new MAList probes 1:100 and samples 1:10. Sean