[BioC] filtering for present calls

Garcia, Joshua A garciaj14 at uthscsa.edu
Fri Jul 15 17:35:16 CEST 2005

I am using the gcrma package in R to analyze affymetrix HGu133A chips and 
would like to normalize only the probes called present by GCOS.  I can 
separate the probes called present from the rest by using the chp file 
exported to excel, however, I would need to recreate it as a .cel file for use 
in R.  Is it possible to do this?  Is it possible to use an excel file in R, 
rather than a .cel file?  Any suggestions?  Any help would be much 


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