A related hint, Google doesn't let you search for %nin%, because it ignores % symbols (and most other punctuation), but cuil does allow you to search: http://cuil.com/search?q=%25nin%25+R
On 5 August 2010 08:53, David Winsemius <dwinsem...@comcast.net> wrote: > The examples in the help page for "%in%" (shared by "match") has the > definition of a "%w/o%" binary operator. > > "%w/o%" <- function(x,y) x[!x %in% y] #-- x without y > since: > "%in%" <- function(x, table) match(x, table, nomatch = 0) > 0 > It appears that you have just re-invented the without-wheel. (which also > seems to be happening a lot in Formula 1 races lately.) > -- > David. > On Aug 5, 2010, at 11:19 AM, 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? >> >> -- >> Ken Williams > > > David Winsemius, MD > West Hartford, CT > > ______________________________________________ > 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. > -- Jeremy Miles Psychology Research Methods Wiki: www.researchmethodsinpsychology.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.