There's a kind of way, but it may be more 'elegant' than fast for large sequences
> start <- c(1,20,50) > stop <- c(7,25,53) > unlist(mapply(Vectorize(seq), start, stop)) [1] 1 2 3 4 5 6 7 20 21 22 23 24 25 50 51 52 53 Bill Venables http://www.cmis.csiro.au/bill.venables/ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chris Oldmeadow Sent: Tuesday, 26 August 2008 2:42 PM To: r-help@r-project.org Subject: [R] sequence with start and stop positions Hi, I have a vector of start positions, and another vector of stop positions, eg start<-c(1,20,50) stop<-c(7,25,53) Is there a quick way to create a sequence from these vectors? new<-c(1,2,3,4,5,6,7,20,21,22,23,24,25,50,51,52,53) the way Im doing it at the moment is pos<-seq(start[1],stop[1]) for (i in 2:length(start)){ new<-seq(start[i],stop[i]) pos<-c(pos,new) } This works on small data, but its very inefficient on large vectors, and is taking forever! Anybody no a better way? many thanks, Chris ______________________________________________ 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.
