Hi ,
 
I was trying read in an affy array/matrix and then to calculate the mean value for all the duplicates. Is there a function in the R package that would do this?
 
I tried the help function and searched for 'duplicate'. Although it provides a list of functions that would eliminate the duplicate probe ids, I couldn't find one that would calculate the mean for the duplicates.
 
Any help would be appreciated.
 
thanks.

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