Here is my attempt at function which computes margins from positions. require("stringr") require("dplyr")
ends<-seq(10,100,8) # end margins test_string<-"Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aliquam in lorem sit amet leo accumsan lacinia." sekoj=function(ends){ l_ends<-length(ends) begs=vector(mode="integer",l_ends) begs[1]=1 for (i in 2:(l_ends)){ begs[i]<-ends[i-1]+1 } margs<-rbind(begs,ends) margs<-cbind(margs,c(ends[l_ends]+1,-1)) #rownames(margs)<-c("beg","end") return(margs) } margins<-sekoj(ends) str_sub(test_string,margins[1,],margins[2,]) %>% print Code to run in browser: http://www.r-fiddle.org/#/fiddle?id=rVmNVxDV 2016-05-11 23:12 GMT+02:00 Bert Gunter <bgunter.4...@gmail.com>: > Dunno -- but you might have a look at Hadley Wickham's 'stringr' package: > https://cran.r-project.org/web/packages/stringr/stringr.pdf > > 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 Wed, May 11, 2016 at 1:12 PM, Jan Kacaba <jan.kac...@gmail.com> wrote: >> Dear R-help >> >> I would like to split long string at specified precomputed positions. >> 'substring' needs beginings and ends. Is there a native function which >> accepts positions so I don't have to count second argument? >> >> For example I have vector of possitions pos<-c(5,10,19). Substring >> needs input first=c(1,6,11) and last=c(5,10,19). There is no problem >> to write my own function. Just asking. >> >> Derek >> >> ______________________________________________ >> 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. ______________________________________________ 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.