Something like:
# Sample data g1<-c("gene1", "gene2", "gene3", "gene4", "gene5", "gene9", "gene10", "geneA") g2<-c("gene6", "gene9", "gene1", "gene2", "gene7", "gene8", "gene9", "gene1", "gene10") df1<-cbind(gene=g1, expr=runif(length(g1))) df2<-cbind(gene=g2, expr=runif(length(g2))) # Merge mdf<-merge(df1, df2, by="gene", sort=T) # Unique list ug<-unique(mdf[,"gene"]) You may find the "match" command useful and/or the "%in%" opertaor. JS --- -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of jenny tan Sent: 26 July 2007 04:35 To: r-help@stat.math.ethz.ch Subject: [R] Finding matches in 2 files I have 2 files containing data analysed by 2 different methods. I would like to find out which genes appear in both analyses. Can someone show me how to do this? _________________________________________________________________ [[trailing spam removed]] [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch 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@stat.math.ethz.ch 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.