You can't convert an ExpressionSet to an AffyBatch. If you want something that MAplot will do that plotMA won't, you will just have to write the code to do so. Best, Jim On Friday, September 06, 2013 5:19:23 PM, Wang Peter wrote: > thank you > but plotMA can not realize some functions of MAplot. > that is why i need the converter > > > > On Fri, Sep 6, 2013 at 5:03 PM, James W. MacDonald <jmacdon at="" uw.edu=""> <mailto:jmacdon at="" uw.edu="">> wrote: > > library(limma) > ?plotMA > > Best, > > Jim > > > > > On Friday, September 06, 2013 4:35:01 PM, Wang Peter wrote: > > the MAplot function only accept AffyBatch object > but i have a data in ExpressionSet variable > > > how to convert ExpressionSet to AffyBatch > > thank you very much > > > > > -- > James W. MacDonald, M.S. > Biostatistician > University of Washington > Environmental and Occupational Health Sciences > 4225 Roosevelt Way NE, # 100 > Seattle WA 98105-6099 > > > > > -- > shan gao > Room 231(Dr.Fei lab) > Boyce Thompson Institute for Plant Research > Cornell University > Tower Road, Ithaca, NY 14853-1801 > Office phone: 1-607-254-1267(day) > Official email:sg839 at cornell.edu <mailto:email%3asg839 at="" cornell.edu=""> > Facebook:http://www.facebook.com/profile.php?id=100001986532253 -- James W. MacDonald, M.S. Biostatistician University of Washington Environmental and Occupational Health Sciences 4225 Roosevelt Way NE, # 100 Seattle WA 98105-6099