Here's a hint: > y <- which(x>100) > identical(y,y) # TRUE > identical(y,-y) # TRUE
The '-' is misleading - it is absorbed into the empty y, leaving the request x[y] to be x for an empty set of indices. HTH, Eric On Wed, Apr 18, 2018 at 2:13 PM, Ashim Kapoor <ashimkap...@gmail.com> wrote: > Dear All, > > Here is a reprex: > > > x<- 1:100 > > x[-which(x>100)] > integer(0) > > In words, I am finding out which indices correspond to values in x which > are greater than 100 ( there are no such items ) . Then I remove those > indices. I should get back the x that I started with since there are no > items in x which are bigger than 100 . Instead, it is returning an empty > vector. > > Why is this ? What am I misunderstanding? > > Best Regards, > Ashim > > [[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. > [[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.
