Message-ID: <907182718.23360012.1346625884178.JavaMail.root@zm09.stanford.edu>
Date: 2012-09-02T22:44:44Z
From: Hon Kit (Stephen) Wong
Subject: a newbie seeking for a simple problem
In-Reply-To: <1250906260.23358270.1346625306333.JavaMail.root@zm09.stanford.edu>
Dear Experienced R users,
I have a looks-like simple but complicated problem urgently needed to be solved. Below is the detail:
I have two dataframes, df1, df2. df1 contains two column and many thousands rows: column 1 is a "gene_name", column 2 is "value". df2 contains only one column which is "gene_name" with couple hundred rows. I want to change "value" of df2 for those "gene_name" also appear in df2 "gene_name". How to do that? Millions thanks.
Ste