R split numeric vector at position

by

An improvement would be:

splitAt <- function(x, pos) unname(split(x, cumsum(seq_along(x) %in% pos)))

which can now take a vector of positions:

splitAt(a, c(2, 4))
# [[1]]
# [1] 1
# 
# [[2]]
# [1] 2 2
# 
# [[3]]
# [1] 3

And it does behave properly (subjective) if pos <= 0 or pos >= length(x) in the sense that it returns the whole original vector in a single list item. If you’d like it to error out instead, use stopifnot at the top of the function.

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