CODEWITHSUNDEEP
rlist
Andre Elrico
Andre Elrico

Reputation: 11480

Turn list into "list of lists"

How can i transform the first "long" list l:

l <- list()
n=1
for (i in 1:9) {
  l[[length(l)+1]] <- n:(n+2)
  n=n+3
}

into a wider but shorter list of lists lol: In the next code segment im breaking after every 3 Elements of l.

lol <- list()
lol[[1]] <- list(1:3,4:6,7:9)
lol[[2]] <- list(10:12,13:15,16:18)
lol[[3]] <- list(19:21,22:24,25:27)

Any ideas? What if i want to break after every 2 Elements of l.

Upvotes: 2

Views: 170

Answers (1)

akuiper
akuiper

Reputation: 214927

You can split it by a vector 1,1,1,2,2,2,3,3,3:

n = 3                                     # the length of each sub list
split(l, (seq_along(l) - 1) %/% n)

identical(lol, setNames(split(l, (seq_along(l) - 1) %/% 3), NULL))
# [1] TRUE

Upvotes: 2

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