For each element of nvec the sequence seq_len(nvec[i])
is created. These are concatenated and the result returned.
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.
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.
sequence(c(3, 2)) # the concatenated sequences 1:3 and 1:2.
#>  1 2 3 1 2
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