Why not just do: lst2 <- c(list(NULL), lst)
-- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of Peter Langfelder > Sent: Monday, September 20, 2010 9:52 PM > To: r-help > Subject: Re: [R] Lists with NULL entries > > Hi Joshua, > > thanks, I came up with that solution myself after a bit of thinking. > Normally I wouldn't worry about NULL components of lists, but dimnames > is a list and often some components are null and is therefore a bit > tricky to manipulate... > > Peter > > On Mon, Sep 20, 2010 at 7:39 PM, Joshua Wiley <jwiley.ps...@gmail.com> > wrote: > > Sorry, that was a really half-hearted reply. This will create a new > > list that is the old list shifted down (and should be much faster > than > > the for loop too). > > > > lst <- list(NULL,2) > > lst2 <- vector("list", length(lst) + 1) > > lst2[2:length(lst2)] <- lst > > lst > > lst2 > > > > If you really need to use a for loop, maybe try filling it with NAs > > instead of NULLs? > > > > Josh > > ______________________________________________ > 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. ______________________________________________ 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.
