dear all,
I have a little problem I am doing a loop, witha grep function. sometimes it
happens that have the following results
> tmp <- grep("x", y)
> tmp
integer(0)
how can I recognise this outcome? is.na is not working of course, so what
else?
thank you
[[alternative HTML version deleted]]
______________________________________________
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.
