What is the rationale for the following warning in R-3.2.2?
> is.na(expression(abcd))
[1] FALSE
Warning message:
In is.na(expression(abcd)) :
is.na() applied to non-(list or vector) of type 'expression'
[[alternative HTML version deleted]]
______________________________________________
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.
