Hi, May be this also helps: do.call(rbind,lapply(split(vec,findInterval(vec,c(4,9))),function(x) paste0(sum(x),"=",paste(x,collapse="+")))) [,1] #0 "6=1+2+3" #1 "30=4+5+6+7+8" #2 "19=9+10" a.K.
----- Original Message ----- From: Sam Steingold <s...@gnu.org> To: r-help@r-project.org Cc: Sent: Monday, December 10, 2012 2:29 PM Subject: [R] sum portions of a vector How do I sum portions of a vector into another vector? E.g., for --8<---------------cut here---------------start------------->8--- > vec <- 1:10 > breaks <- c(3,8,10) --8<---------------cut here---------------end--------------->8--- I want to get a vector of length 3 with content --8<---------------cut here---------------start------------->8--- 6 = 1+2+3 30 = 4+5+6+7+8 19 = 9+10 --8<---------------cut here---------------end--------------->8--- Obviously, I could write a loop, but I would rather have a vectorized version. Thanks! -- Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000 http://www.childpsy.net/ http://palestinefacts.org http://ffii.org http://jihadwatch.org http://www.PetitionOnline.com/tap12009/ One can find Holy Grail or Higgs boson, but not the second sock. ______________________________________________ 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.
