thank you for your reply well, you are resorting to a supposed order of i which is not necessary the case, and in fact is not in mine...
consider this example, please d<-data.frame(i=c(8,12,3), s=c('97,918,19','103,1205', '418'), stringsAsFactors = FALSE) d Da: "Bert Gunter" <bgunter.4...@gmail.com> A: "Massimo Bressan" <massimo.bres...@arpa.veneto.it> Cc: "r-help" <R-help@r-project.org> Inviato: Martedì, 12 giugno 2018 16:42:18 Oggetto: Re: [R] extract and re-arrange components of data frame You mean like this? > s.new <-with(d, as.numeric(unlist(strsplit(s,",")))) > s.new <- cut(s.new,breaks = c(0,100,110,200),lab = d$i) > s.new [1] 1 1 1 2 2 3 Levels: 1 2 3 (Obviously, this could be a one-liner) See ?cut Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Tue, Jun 12, 2018 at 6:32 AM, Massimo Bressan < massimo.bres...@arpa.veneto.it > wrote: # considering this data.frame as a reproducible example d<-data.frame(i=c(1,2,3), s=c('97,98,99','103,105', '118'), stringsAsFactors = FALSE) d #I need to get this final result r<-data.frame(i=c(1,1,1,2,2,3), s=c(97, 98, 99, 103, 105, 118)) r #this is my attempt #number of components for each element (3) of the list #returned by strsplit n<-unlist(lapply(strsplit(d$s,','), length)) #extract components of all elements of the list s<-cbind(unlist(strsplit(d$s,','))) #replicate each element of i #by the number of components of each element of the list i<-rep(d$i, n) i #compose final result r_final<-data.frame(i,s, stringsAsFactors = FALSE) r_final #I'm not much satisfied by the approach, it seems to me a bit clumsy... #any help for improving it? #thanks #a novice [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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 -- To UNSUBSCRIBE and more, see 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.