Or even > a <- 1:5 > [lots of other code] > x <- ifelse( a < 3, 1, 2)
The point (in this example) is that you might have introduced a bug because you forgot that 'a' is a vector. Looking (in isolation) at the assignment to 'x' you believe it's going to be a single number, either 1 or 2 (unless you know the "shape" of a). I've been burned by such issues. On Wed, Jul 10, 2019 at 4:42 PM Eric Berger <ericjber...@gmail.com> wrote: > For example, can you predict what the following code will do? > > a <- 1:5 > > b <- c(2,3) > > ifelse( a < 3, 1, b) > > > On Wed, Jul 10, 2019 at 4:34 PM José María Mateos <ch...@rinzewind.org> > wrote: > >> On Wed, Jul 10, 2019, at 04:39, Eric Berger wrote: >> > 1. The ifelse() command is a bit tricky in R. Avoiding it is often a >> good >> > policy. >> >> You piqued my curiosity, can you elaborate a bit more on this? >> >> -- >> José María (Chema) Mateos || https://rinzewind.org >> >> ______________________________________________ >> 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.
