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For each element of nvec the sequence seq_len(nvec[i]) is created. These are concatenated and the result returned.

nvec

seq_len(nvec[i])

sequence(nvec)

a non-negative integer vector each element of which specifies the end point of a sequence.

Earlier versions of sequence used to work for 0 or negative inputs as seq(x) == 1:x.

sequence

seq(x) == 1:x

Note that sequence <- function(nvec) unlist(lapply(nvec, seq_len)) and it mainly exists in reverence to the very early history of R.

sequence <- function(nvec) unlist(lapply(nvec, seq_len))

gl, seq, rep.

gl

seq

rep

sequence(c(3, 2)) # the concatenated sequences 1:3 and 1:2. #> [1] 1 2 3 1 2

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