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_bo...@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]] > > ______________________________________________ > R-help@r-project.org mailing list > 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. ______________________________________________ R-help@r-project.org mailing list 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.
