You don't say what happens if both arrays have non-missing entries, but assuming that doesn't happen:
> ifelse(is.na(xf),xg,xf) [1] "W" "k" "h" NA "g" "r" "j" NA "v" "d" NA "v" NA "z" "r" "r" "i" ---------------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352 -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Erin Hodgess Sent: Thursday, June 16, 2011 8:59 PM To: R help Subject: [R] combining strings Dear R People: Suppose I have the following two character vectors: xf [1] "W" NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA > xg [1] NA "k" "h" NA "g" "r" "j" NA "v" "d" NA "v" NA "z" "r" "r" "i" > I want to end up with "W" "k" "h" ... What is the best way to achieve this, please? I was thinking that if there is an exclusive "or" that it might work. I've tried all kinds of ifs, and ifelse, to no avail. Thanks, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: erinm.hodg...@gmail.com ______________________________________________ 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.
