On 8/24/07, Gabor Grothendieck <[EMAIL PROTECTED]> wrote: > Here are two solutions: > > > logvec <- c(TRUE,FALSE,FALSE,TRUE,FALSE,FALSE,TRUE,FALSE) > > > ifelse(logvec, seq_along(logvec), 0) > [1] 1 0 0 4 0 0 7 0 > > > replace(logvec * 0, logvec, which(logvec)) > [1] 1 0 0 4 0 0 7 0
Actually the * 0 is not needed. The last one could simply be: replace(logvec, logvec, which(logvec)) > > > On 8/24/07, Leeds, Mark (IED) <[EMAIL PROTECTED]> wrote: > > I have the code below which gives me what I want for temp based on > > logvec but I was wondering if there was a shorter way ( i.e : > > a one liner ) without having to initialize temp to zeros. This is > > purely for learning purposes. Thanks. > > > > logvec <- c(TRUE,FALSE,FALSE,TRUE,FALSE,FALSE,TRUE,FALSE) > > > > temp<-numeric(length(invec)) > > temp[invec]<-which(invec) > > temp > > > > [1] 1 0 0 4 0 0 7 0 > > > > obviously, the code below doesn't work. > > > > temp <- which(invec) > > > temp > > [1] 1 4 7 > > -------------------------------------------------------- > > > > This is not an offer (or solicitation of an offer) to buy/se...{{dropped}} > > > > ______________________________________________ > > R-help@stat.math.ethz.ch 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@stat.math.ethz.ch 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.