sequence {base} | R Documentation |
The default method for sequence
generates the sequence
seq(from[i], by = by[i], length.out = nvec[i])
for each
element i
in the parallel (and recycled) vectors from
,
by
and nvec
. It then returns the result of concatenating
those sequences.
sequence(nvec, ...) ## Default S3 method: sequence(nvec, from = 1L, by = 1L, ...)
nvec |
coerced to a non-negative integer vector each element of which specifies the length of a sequence. |
from |
coerced to an integer vector each element of which specifies the first element of a sequence. |
by |
coerced to an integer vector each element of which specifies the step size between elements of a sequence. |
... |
additional arguments passed to methods. |
Negative values are supported for from
and
by
. sequence(nvec, from, by=0L)
is equivalent to
rep(from, each=nvec)
.
This function was originally implemented in R with fewer features, but it has since become more flexible, and the default method is implemented in C for speed.
Of the current version, Michael Lawrence based on code from the S4Vectors Bioconductor package
sequence(c(3, 2)) # the concatenated sequences 1:3 and 1:2. #> [1] 1 2 3 1 2 sequence(c(3, 2), from=2L) #> [1] 2 3 4 2 3 sequence(c(3, 2), from=2L, by=2L) #> [1] 2 4 6 2 4 sequence(c(3, 2), by=c(-1L, 1L)) #> [1] 1 0 -1 1 2