Hi Max, This is known as fuzzy matching. When using `$`, if R can uniquely match the element name based on what is typed, it returns it. Thus, in your example, foo uniquely matches foobar, but if you had foobar, foobox, $foo would not be a unique match.
Cheers, Josh On Mon, Mar 25, 2013 at 12:21 PM, Andrew Lin <hlin0...@gmail.com> wrote: > Hi folks, > > I am starter for R. While I tried list as following: > >> l <- list() >> l$foo > NULL >> l$foobar <- 1 >> l$foo > [1] 1 > > Apparently, foo and foobar are different name for elements in list (actually > foo does not exist). But why they are sharing same value? > > Thanks a lot! > > Max > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > 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. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://joshuawiley.com/ Senior Analyst - Elkhart Group Ltd. http://elkhartgroup.com ______________________________________________ R-help@r-project.org mailing list 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.