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

[Rolf Turner]

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'').

	cheers,

		Rolf Turner

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