Re: [R] does column exist?

From: <apjaworski_at_mmm.com>
Date: Fri 20 May 2005 - 03:53:24 EST

There may be a simpler way, but this

is.na(match("X", names(df)))

should return TRUE if the column name exists and FALSE otherwise.

Cheers,

Andy



Andy Jaworski
518-1-01
Process Laboratory
3M Corporate Research Laboratory

E-mail: apjaworski@mmm.com
Tel: (651) 733-6092
Fax: (651) 736-3122
                                                                           
             Omar Lakkis                                                   

<uofiowa@gmail.co
m> To Sent by: r-help@stat.math.ethz.ch r-help-bounces@st cc at.math.ethz.ch Subject [R] does column exist? 05/19/2005 12:42 PM Please respond to Omar Lakkis
<uofiowa@gmail.co
m>

How do I test if a data.frame has a column named X? exists(o) checks if the object exists or not, I want to test if a data.frame object (df) has a column names(X), something like: exists(df$X)



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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 Received on Fri May 20 04:04:07 2005

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