Thanks a lot for all who've provided suggestions! Gang
On Nov 15, 2007, at 5:09 PM, Duncan Murdoch wrote: > On 11/15/2007 4:54 PM, Gang Chen wrote: >> I want to identify whether a variable is character(0), but get >> lost. For example, if I have >> > dd<-character(0) >> the following doesn't seem to serve as a good identifier: >> > dd==character(0) >> logical(0) >> So how to detect character(0)? > > (length(dd) == 0) && (typeof(dd) == "character") > > or if you really want to be specific (and rule out things that just > act like character(0) in most respects) > > identical(dd, character(0)) > > Duncan Murdoch ______________________________________________ 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.
