?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. > [[alternative HTML version deleted]] ______________________________________________ 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.