How to make a list of integer vectors in R

Question

Basic question: In R, how can I make a list and later populate it with vector elements?

l <- list() 
l[1] <- c(1,2,3) 

This gives the err

Answer 1

Use [[1]] as in

l[[1]] <- c(1,2,3)
l[[2]] <- 1:4

and so. Also recall that preallocation is much more efficient, so if you know how long your list is going to be, use something like

l <- vector(mode="list", length=N)