[R] alist()

[Peter Dalgaard]

Glen Herrmannsfeldt <gah4 at u.washington.edu> writes:

> In trying to get NULL members into a list, I found out about alist().
> 
> x<-alist()

(that is the same as x <- list(). I don't think alist() is relevant.)
 
> x$one<-1
> x$two<-NULL
> 
> but x$two doesn't exist.
> 
> It seems, though, that an alist is just a list.
> 
> How can one put NULL members into a list?


Like this:

> x["two"] <- list(NULL)
> x
$two
NULL

or just put it there with x <- list(two=NULL)


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