
thnkyou very much micheal.
i worked!!!
regards
eliza
 

> From: michael.weylandt@gmail.com
> Date: Tue, 18 Sep 2012 15:58:31 +0100
> Subject: Re: [R] extracting column and regular interval in R
> To: eliza_botto@hotmail.com
> CC: r-help@r-project.org
> 
> x[c(TRUE, rep(FALSE, 36)),]
> 
> and let recycling work its magic!
> 
> To concretize:
> 
> x <- 1:100
> 
> x[c(TRUE, rep(FALSE, 4))]
> 
> Cheers,
> Michael
> 
> On Tue, Sep 18, 2012 at 3:55 PM, eliza botto <eliza_botto@hotmail.com> wrote:
> >
> > Dear R users,
> > i have a matrix with 31 rows and 444 columns and i want to extract every 37th column of that matrix starting from 1. more precisely i want to select columns 1, 38,75, 112 and so on. then doing the same by starting from column number 2(2,39,76,113.......).
> > i know that there is a manual way of doing it but i wanted to make it more quickly as i have fairly large data to dealth with.
> >
> > thanks in advance
> > eliza
> > [[alternative HTML version deleted]]
> >
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