This is very interesting. Thanks for sharing. On Fri, Oct 13, 2023 at 10:25 AM Richard O'Keefe <rao...@gmail.com> wrote: > > ?ifelse > 'ifelse' returns a value with the same shape as 'test' which is > filled with elements selected from either 'yes' or 'no' depending > on whether the element of 'test' is 'TRUE' or 'FALSE'. > > This is actually rather startling, because elsewhere in the > S (R) language, operands are normally replicated to the length > of the longer. Thus > c(1,2,3)*10 + c(5,6) > first (notionally) replicates 10 to c(10,10,10) > and then c(5,6) to c(5,6,5), yielding c(15,26,35). > And this *does* happen, sort of. > > ifelse(c(F,T,F), c(1,2,3), c(5,6)) > => 5 2 5. > But it *doesn't* apply to the test. > > There's another surprise. Years ago I expected that > all three arguments would be evaluated, then length > adjusted, and then processing would be done. > But the 2nd argument is evaluated (in full) if and only > if some element of the test is true, > and the 3rd argument is evaluated (in full) if and oly > if some element of the test is false. > ifelse(c(NA,NA), stop("true"), stop("false")) > => c(NA,NA). > > At any rate, what you want is if (<test>) <tp> else <fp> > > > > On Fri, 13 Oct 2023 at 09:22, Christofer Bogaso <bogaso.christo...@gmail.com> > wrote: >> >> Hi, >> >> Following expression returns only the first element >> >> ifelse(T, c(1,2,3), c(5,6)) >> >> However I am looking for some one-liner expression like above which >> will return the entire vector. >> >> Is there any way to achieve this? >> >> ______________________________________________ >> 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.