Hi Nan, See ?ifelse
edu[,2] <- ifelse(edu[,1] < 0.5, 1, 2) edu HTH, Jorge On Mon, Aug 2, 2010 at 9:16 PM, Hey Sky <> wrote: > Hey, Rers > > I am new to R and this question may has been asked many times or a very old > one. I have checked > > the archive but found nothing (maybe I used the wrong key words). any > advise is > appreciated > > the question is: > > I try to replace a col vector with some other values, see > > edu<-matrix(0,1000,2) > > edu1<-runif(1000,0,1) > edu[,1]<-edu1 > > the colum vector edu[,1] would have value between 0 and 1. if I want to > replace the value of edu[,2] > > to 1 if edu[,1] less than 0.5, how to do it in the form of matrix but > not under > a loop structure? > > I have tried: > > if (edu[,1]>=0.5) edu[,2]=1 > > there is only the first 0.5 have been done but not all the others. thanks > for > any kind answer. > > Nan > from Montreal > > > > ______________________________________________ > 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.
