Dear All, we would like to use the computeRawQ function, but the documentation is very scarce: Arguments fname                    character string with the filename of the GeneChip intensity                    vector of intensities for the GeneChip probe.index             vector of indices for each probe probe.zoneID         vector of zone ID numbers for each probe bgCells                    number of background cells for the GeneChip NumberZones         number of zones on the GeneChip celfile.path                 character denoting the path for the *.CEL files specified in fname However, we cannot run the function based on this description. For example we do not know what are the "background cells" or "number of zones". Is there somewhere a detailed description (the whitepaper on the bottom of the page does not deliver any info), or at least a sample application? Thanks Balazs ------------------------- Balázs GYÖRFFY MD, PhD Joint Research Laboratory of the Hungarian Academy of Sciences and the Semmelweis University, Semmelweis University 1st Dept. of Pediatrics Bokay u. 53-54. H-1083 Budapest Office: +36 1 266 0926 /52772 Fax: +36 1 3036 077 Email: zsalab2@yahoo.com [[alternative HTML version deleted]]