[R] a newbie seeking for a simple problem

[Jeff Newmiller]

Read the posting guide... you need to provide more specific information such as sample data (?dput).

For this problem you should probably read

?merge
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Sent from my phone. Please excuse my brevity.

"Hon Kit (Stephen) Wong" <honkit at stanford.edu> wrote:

>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
>
>______________________________________________
>R-help at 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.