Dear Knut, > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Knut > Krueger > Sent: Friday, October 26, 2018 2:29 AM > To: r-help mailing list <r-help@r-project.org> > Subject: Re: [R] "logical indexing, " [was] match() question or needle > haystack > problem for a data.frame > > Am 25.10.18 um 16:13 schrieb peter dalgaard: > > > > > > Yes: x[!(x$A %in% y$B),] > > Ok thats in my opinion a little workaround
Not a work-around but a solution. That is, one can't expect to find an existing function for every problem. > why?: > > There is an > = and != Actually == and != > < and > > > > means the opposite is available between terms. > > why is there f.e no %!in%, %notin% or !%in% > > This would be more intuitive. If you feel strongly about this, it's not hard to supply it: > `%!in%` <- function(x, y) !(x %in% y) > (1:4) %in% (2*1:4) [1] FALSE TRUE FALSE TRUE > (1:4) %!in% (2*1:4) [1] TRUE FALSE TRUE FALSE Best, John ----------------------------------------------------------------- John Fox Professor Emeritus McMaster University Hamilton, Ontario, Canada Web: https://socialsciences.mcmaster.ca/jfox/ > > Kind regards Knut > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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 -- To UNSUBSCRIBE and more, see 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.
