Hello,
   
  I have struggled the following simple commands for long time, can you please fix the problem?
   
  > library("affydata")
> data(Dilution)
> pm(Dilution, "1001_at")[1:3, ]
Error in assayData(object) : 
  no slot of name "assayData" for this object of class "AffyBatch"
 
  Thanks
  Yuan
   

       
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