For each element of `nvec`

the sequence `seq_len(nvec[i])`

is created. These are concatenated and the result returned.

`sequence(nvec)`

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`

.

Note that `sequence <- function(nvec) unlist(lapply(nvec, seq_len))`

and it mainly exists in reverence to the very early history of R.

# NOT RUN { sequence(c(3, 2)) # the concatenated sequences 1:3 and 1:2. #> [1] 1 2 3 1 2 # }

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