Hi, 
    I am a new user of Bioconductor. I have a bunch of cel files from Affymetrix genechip. The gene expression data I used to work with have both the expression value and detection calls. Could somebody tell me how to convert cel files using bioconductor packages? My cel files are txt files, not binary files. I can read in the file using the package affy, but I don't know how to convert those files to the format I want to use (one column probe name, one column expression value, and one column detection calls (A,M,P), maybe there are another two columns, but they are not important). 
   
    Many thanks.
   
   James

		
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