[R] Dimensioning lists.
Rolf Turner
r@turner @end|ng |rom @uck|@nd@@c@nz
Mon Feb 15 04:35:11 CET 2021
I have a setting in which it would be convenient to treat a list
as an array, i.e. to address its entries via a pair of indices.
A toy example:
xxx <- vector("list",9)
set.seed(42)
for(i in 1:9) xxx[[i]] <- list(a=sample(letters,1),b=sample(1:100,1))
I would like to be able to treat "xxx" as a 3 x 3 matrix.
I tried
dim(xxx) <- c(3,3)
When I do, e.g.
xxx[2,3]
I get:
> [[1]]
> [[1]]$a
> [1] "n"
>
> [[1]]$b
> [1] 20
That is I get a list of length 1, whose (sole) entry is the desired
object. I would *like* to get just the desired object, *not* wrapped in
a list, i.e.:
> $a
> [1] "n"
>
> $b
> [1] 20
>
(which is what I get by typing xxx[2,3][[1]]).
Is there any way to prevent the entries of xxx from being wrapped up in
lists of length 1?
Thanks for any enlightenment.
cheers,
Rolf Turner
--
Honorary Research Fellow
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276
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