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.