Don't know if this has come up before, but ... > x <- c(0,0) > length(x) [1] 2 ## but > stopifnot(length(x)) Error: length(x) is not TRUE Called from: top level ## but > stopifnot(length(x) > 0) ## not an error; nor is > stopifnot(as.logical(length(x))) ## Ouch!
Maybe the man page should say something about not assuming automatic coercion to logical, which is the usual expectation. Or fix this. Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
