Re: [R] question about a small "for" loop

From: milton ruser <milton.ruser_at_gmail.com>
Date: Mon, 14 Jul 2008 18:41:26 -0300

May be this helps:

jaw<-data.frame(vara=1:20,age=runif(20))

for (i in 2:6) {
 jaw[paste("agepow",i, sep="")] <- jaw["age"]^i  }

jaw<-round(jaw,2) # It is just to help the check task

Cheers,

Miltinho Astronauta

Brazil

On 7/14/08, Christopher W. Ryan <cryan_at_binghamton.edu> wrote:
>
> R 2.5.1 on WinXP
>
> I'm trying to create new variables in a dataframe called jaw, as powers
> of jaw$age up to the sixth power, and name them
>
> jaw$age.(--the digit corresponding to the power--)
>
> Obviously none of these work (silly for me to try, I suppose):
>
> for (i in 2:6) {
> jaw$age.'i' <- jaw$age^i
> }
>
> for (i in 2:6) {
> jaw$age.i <- jaw$age^i
> }
>
> for (i in 2:6) {
> jaw$age."i" <- jaw$age^i
> }
>
> What is the proper syntax to create and name these variables all at once?
>
> Thanks.
>
> --Chris
> --
> Christopher W. Ryan, MD
> SUNY Upstate Medical University Clinical Campus at Binghamton
> 40 Arch Street, Johnson City, NY 13790
> cryanatbinghamtondotedu
> PGP public keys available at http://home.stny.rr.com/ryancw/
>
> "If you want to build a ship, don't drum up the men to gather wood,
> divide the work and give orders. Instead, teach them to yearn for the
> vast and endless sea." [Antoine de St. Exupery]
>
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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. Received on Mon 14 Jul 2008 - 22:00:27 GMT