Just FYI, the Hmisc package has had an implementation of %nin% for some
time now.
Ken Williams wrote:
Sometimes I write code like this:
qf.a <- subset(qf, pubid %in% c(104, 106, 107, 108))
qf.b <- subset(qf, !pubid %in% c(104, 106, 107, 108))
and I get a little worried that maybe I've remembered the precedence rules
wrong, so I change it to
qf.a <- subset(qf, pubid %in% c(104, 106, 107, 108))
qf.b <- subset(qf, !(pubid %in% c(104, 106, 107, 108)))
and pretty soon my code looks like fingernail clippings (or Lisp) and I'm
thinking about precedence rather than my original task. So I write a %nin%
operator which I define as:
`%nin%` <- function (x, table) match(x, table, nomatch = 0L) == 0L
and then I'm happy again.
I wonder, would something like this find a home in core R? Or is that too
much syntactic sugar for your taste?
______________________________________________
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.
