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...topRG$R[,1]<500&topRG$R[,2]<500&topRG$R[,5]<500) However, this just returned me a matrix with one row of $R (the ranks were <500 for columns 1,2, and 5 and greater than 500 for 3,4,and 6). However, I can't believe that there is only one gene that is in the top 500 for R intensitiy among those three arrays. Am I doing something wrong? Can someone think of a better way of doing this? Thanks Alison ****************************************** Alison S. Waller M.A.Sc. Doctoral Candidate awaller@chem-eng.utoronto.ca 416-978-4222 (lab) Department of Chemical Eng...