Something like this. Create empty vector of correct length, paste values into
it and then use names(mydata) <- myvector.
x <- data.frame(aa=1:10, bb=letters[1:10])
myvector <- c(rep(NA,length(x)))
for (i in 1:length(names(x))) {
myvector[i] <- paste("SURV_",i, sep="")
}
--- On Thu, 8/13/09, Mark Na <mtb...@gmail.com> wrote:
> From: Mark Na <mtb...@gmail.com>
> Subject: [R] How to rename columns that start with numbers?
> To: r-help@r-project.org
> Received: Thursday, August 13, 2009, 6:24 PM
> Hello,
>
> My dataframe has new columns that start with the number 1
> or 2 (resulting
> from a reshape cast command).
>
> Instead of having these columns automatically renamed by R
> so start with the
> letter X, I would like to rename these columns to start
> with the characters
> "SURV_" (e.g., SURV_1, SURV_2).
>
> I can't seen to use grep() to identify and rename the
> columns starting with
> either 1 or 2.
>
> Any help would be much appreciated, thanks!
>
> (I know I could rename these manually, but the above is a
> simpler statement
> of the actual problem, which involves several dozen
> columns, so that's why
> I'd prefer not to so it manually)
>
> Mark Na
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org
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