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: [email protected]
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?
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
