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.
