Hi. Here are two approaches: c(mapply(function(x,y) rep(c(x,y), 2), (1:10)[c(T,F)], (1:10)[c(F,T)]))
c(tapply(1:10, rep(1:(10/2), each=2), rep, 2), recursive=T) Andrija On Mon, Nov 11, 2013 at 1:11 PM, Federico Calboli <f.calb...@imperial.ac.uk>wrote: > Hi All, > > I am trying to create an index that returns something like > > 1,2,1,2,3,4,3,4,5,6,5,6,7,8,7,8 > > and so on and so forth until a predetermined value (which is obviously > even). I am trying very hard to avoid for loops or for loops front ends. > > I'd be obliged if anybody could offer a suggestion. > > BW > > F > > ______________________________________________ > 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. > > [[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.
