On Sat, Jul 4, 2009 at 7:56 PM, Mark Kimpel<mwkim...@gmail.com> wrote: > I am using grep to locate colnames to automate a report build and have > run into a problem when a colname is not found. The use of integer(0) > in a conditional statement seems to be a no no as it has length 0. > Below is a self-contained trivial example. I would like to get > something like "NA" or -1 for the position when it is not found OR > learn a way to use integer(0) or some "cast" of it in a logical > statement. Example, output, and sessionInfo follow. Thanks, Mark
You might also consider using grepl instead of grep. grepl works just like grep, but returns a logical vector. Hadley -- http://had.co.nz/ ______________________________________________ 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.
