There's many additional operators defined in the mvbutils package, including %!in%.
Kevin On Thu, Aug 5, 2010 at 10:25 AM, David Huffer <david.huf...@csosa.gov>wrote: > See Harrell's Hmisc package > > -- > David Huffer, Ph.D. > Deputy Director > CSOSA/ORE > Washington, DC > > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On Behalf Of Ken Williams > Sent: Thursday, August 05, 2010 11:20 AM > To: r-help@r-project.org > Subject: [R] A %nin% operator? > > 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? > > -- > Ken Williams > Sr. Research Scientist > Thomson Reuters > Phone: 651-848-7712 > ken.willi...@thomsonreuters.com > > ______________________________________________ > 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. > > ______________________________________________ > 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. > -- Kevin Wright [[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.
