Re: [R] Howto access V-base only column in a data frame

From: Marc Schwartz <>
Date: Fri, 20 Jun 2008 08:01:23 -0500

on 06/19/2008 11:28 PM Rolf Turner wrote:
> On 20/06/2008, at 4:07 PM, Moshe Olshansky wrote:

>> If you know the value of k then you could do the following:
>> goodNames <- paste("V",1:k,sep="")
>> ind <- which(colnames(df) %in% goodNames)
>> df[,ind]
>> (where df is your dataframe).
>> P.S. I won't be surprised if df[,goodNames] is all right too (have not 
>> checked).

> What about df[,grep("^V",names(df))] ? (Leave off the ``^'' if you want
> any
> column whose name contains ``V'' (r.t. begins with ``V'').

Unless I missed something in the original request, such that the only column to remove is 'var', why not:

   subset(df, select = -var)


See ?subset

HTH, Marc Schwartz mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Fri 20 Jun 2008 - 13:37:05 GMT

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