On Fri, 18 Dec 2009 10:13:03 +0100 florian.hahne at novartis.com wrote: > median(exprs(Data(wf[["Treg+"]])[,whateverYourChannelIs])) Thank you very much. Another nice thing would be to have the pData, or select pData, be exported if desired along with the 'summary(wf)' command. Thanks, Aric