R How to replicate nulls in a list

Question

list(list(NULL,NULL),list(NULL,NULL))

The result is:

[[1]]
[[1]][[1]]
NULL

[[1]][[2]]
NULL

[[2]]
[[2]][[1]]
NULL

[[2]][[2]]
NULL

Supposing I want to do this for larger numbers than 2, is there a way to get the same list structure with replicate?

Answer 1

Use replicate

replicate(n=3, {replicate(n=3,NULL,simplify=FALSE)},simplify=FALSE)


[[1]]
[[1]][[1]]
NULL

[[1]][[2]]
NULL

[[1]][[3]]
NULL


[[2]]
[[2]][[1]]
NULL

[[2]][[2]]
NULL

[[2]][[3]]
NULL


[[3]]
[[3]][[1]]
NULL

[[3]][[2]]
NULL

[[3]][[3]]
NULL

Or more simplly (thanks @RichardScriven)

replicate(3, list(replicate(3, list(NULL))))