> a variable that equals 1 for the elements I want to select: > > t = c(1,1,1,0,0)
How do you typically make such a variable? If you use something like t <- ifelse(x == "Yes", 1, 0) you should instead use t <- x == "Yes" Naming the variable something like 'isYes' instead of 't' might help as well. -Bill On Wed, Jun 23, 2021 at 8:11 AM Phillips Rogfield <thebudge...@gmail.com> wrote: > I make the same mistake all over again. > > In particular, suppose we have: > > a = c(1,2,3,4,5) > > and a variable that equals 1 for the elements I want to select: > > t = c(1,1,1,0,0) > > To select the first 3 elements. > > The problem is that > > a[t] > > would repeat the first element 3 times ..... > > I have to either convert `t` to boolean: > > a[t==1] > > Or use `which` > > a[which(t==1)] > > How can I "spot" this error? > > It often happens in long scripts. > > Do I have to check the type each time? > > Do you have any suggestions? > > ______________________________________________ > 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.
