On Mon, 2005-09-19 at 15:34 +0200, [EMAIL PROTECTED] wrote: > Full_Name: Frank Wagner > Version: R 2.1.1 > OS: Windows > Submission from: (NULL) (193.174.73.34) > > > Hi, > The pdf file R-intro descripe on page 27 that lists can be extended by adding > numbers. > Unfortunately, it's not working > ## example : > > # if i did not declare the variable an error occurs : object not found > mylist <- list() > mylist[1] <- list(value1=3, value2=5) > ## Error
You need to use [[x]] to subset a list: > mylist <- list() > mylist[[1]] <- list(value1=3, value2=5) > mylist [[1]] [[1]]$value1 [1] 3 [[1]]$value2 [1] 5 > str(mylist) List of 1 $ :List of 2 ..$ value1: num 3 ..$ value2: num 5 I don't know whether there is a typo on page 27 or not: [x] is valid, it just means something different to [[x]] - as explained on page 26 of said manual. If it was intentional, then IMHO it is not the most clear example of extending a list - the [[x]] notation is what I would expect to have to use - after reading page 26 of course... HTH G -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Gavin Simpson [T] +44 (0)20 7679 5522 ENSIS Research Fellow [F] +44 (0)20 7679 7565 ENSIS Ltd. & ECRC [E] gavin.simpsonATNOSPAMucl.ac.uk UCL Department of Geography [W] http://www.ucl.ac.uk/~ucfagls/cv/ 26 Bedford Way [W] http://www.ucl.ac.uk/~ucfagls/ London. WC1H 0AP. %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
