When does els%in%set give a different result than is.element(els,set)? I assumed they were copied form S+, where they are the same except for argument names, but I may be wrong. Bill Dunlap TIBCO Software wdunlap tibco.com
On Tue, May 6, 2014 at 12:23 PM, Hervé Pagès <hpa...@fhcrc.org> wrote: > On 05/06/2014 08:54 AM, William Dunlap wrote: >> >> You can also use is.element(els,set) instead of the equivalent >> els%in%set > > > No they are not *equivalent*. Equivalent means you could substitute > one by the other in your code without changing its behavior. > > H. > >> and leave your precedence problems behind. >> Bill Dunlap >> TIBCO Software >> wdunlap tibco.com >> >> >> On Mon, May 5, 2014 at 10:35 PM, peter dalgaard <pda...@gmail.com> wrote: >>> >>> >>> On 06 May 2014, at 01:05 , Hervé Pagès <hpa...@fhcrc.org> wrote: >>> >>>> >>>> BTW, that %in% has precedence over arithmetic operations is surprising, >>>> error-prone, and doesn't cover any reasonable use case (who needs to >>>> multiply the logical vector returned by %in% by some value?) but that's >>>> another story: >>> >>> >>> The point here is that the %foo% operators all have the _same_ >>> precedence. In principle, they can be user-coded, and there is no way to >>> express what precedence is desirable. It may turn out slightly weird for >>> %in%, but think of what would happen if %*% had lower precedence than >>> addition. >>> >>> -- >>> Peter Dalgaard, Professor, >>> Center for Statistics, Copenhagen Business School >>> Solbjerg Plads 3, 2000 Frederiksberg, Denmark >>> Phone: (+45)38153501 >>> Email: pd....@cbs.dk Priv: pda...@gmail.com >>> >>> ______________________________________________ >>> R-devel@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-devel > > > -- > Hervé Pagès > > Program in Computational Biology > Division of Public Health Sciences > Fred Hutchinson Cancer Research Center > 1100 Fairview Ave. N, M1-B514 > P.O. Box 19024 > Seattle, WA 98109-1024 > > E-mail: hpa...@fhcrc.org > Phone: (206) 667-5791 > Fax: (206) 667-1319 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
