Hi Eleni Question like this are better served on the bioconductor mailing list.
Nonetheless try this ALL <- topTable(fit2, coef=1, number=Inf) ALL$SYMBOL <- unlist(mget(ALL$ID, hgu133plus2hsentrezgSYMBOL, ifnotfound=NA)) Here ALL is the output from limma for differential expression (ALL$ID is the probe on ENTREZ centric cdf from brainarray). Best Iain ----- Original Message ----- From: Eleni Christodoulou <elenic...@gmail.com> To: r-help@r-project.org Cc: Sent: Monday, 19 March 2012, 18:47 Subject: [R] hgu133plus2hsentrezgprobe library Hello R community, I am processing raw Affymetrix CEL files and I am using the Michigan custom CDF library hgu133plus2hsentrezgprobe. I have been looking for documentation on the function that it contains...I am specifically interested in converting probe names to gene symbols. Does anybody know where I can find it? Thank a lot! Eleni [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.