Hi, Try
> is.null(mylist[[1]]) [1] TRUE Notice the double square brackets. From: ?`[` "The most important distinction between [, [[ and $ is that the [ can select more than one element whereas the other two select a single element." On Thu, Jun 15, 2017 at 11:33 AM, ce <zadi...@excite.com> wrote: > Hi > > I have a list : > > mylist <- list( a = NULL, b = 1, c = 2 ) > >> mylist[1] > $a > NULL > >> is.null(mylist[1]) > [1] FALSE > >> is.null(mylist$a) > [1] TRUE > > why? I need to use mylist[1] > ______________________________________________ > 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. -- Huzefa Khalil PhD Candidate, Department of Political Science, University of Michigan ______________________________________________ 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.
