| rep {base} | R Documentation |
rep replicates the values in x. It is a generic
function, and the default method is described here.
rep.int is a faster simplified version for the commonest case.
rep(x, times, ...) ## Default S3 method: rep(x, times, length.out, each, ...) rep.int(x, times)
x |
a vector (of any mode including a list) or a pairlist or a
POSIXct or POSIXlt object. |
times |
non-negative integer. A vector giving the number of
times to repeat each element if of length length(x), or to
repeat the whole vector if of length 1. |
length.out |
integer. (Optional.) The desired length of the output vector. |
each |
optional integer. Each element of x is
repeated each times. |
... |
further arguments to be passed to or from other methods. |
If times consists of a single integer,
the result consists of the values in
x repeated this many times.
If times is a vector of the same length as
x, the result consists of x[1]
repeated times[1] times,
x[2] repeated times[2] times and so on.
length.out may be given in place of times,
in which case x is repeated as many times as is
necessary to create a vector of this length. If both
length.out and times are specified, times
determines the replication, and length.out can be used to
truncate the output vector (or extend it by NAs).
Non-integer values of times will be truncated towards zero.
If times is a computed quantity it is prudent to add a small fuzz.
A vector of the same class as x.
If the original vector has names, these are also replicated and so will almost always contain duplicates.
If length.out is used to extend the vector, the behaviour is
different from that of S-PLUS, which recycles the existing vector.
Function rep.int is a simple case handled by internal code, and
provided as a separate function purely for S compatibility.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
rep(1:4, 2) rep(1:4, each = 2) # not the same. rep(1:4, c(2,2,2,2)) # same as second. rep(1:4, c(2,1,2,1)) rep(1:4, each = 2, len = 4) # first 4 only. rep(1:4, each = 2, len = 10) # 8 integers plus two NAs rep(1, 40*(1-.8)) # length 7 on most platforms rep(1, 40*(1-.8)+1e-7) # better ## replicate a list fred <- list(happy = 1:10, name = "squash") rep(fred, 5) # date-time objects x <- .leap.seconds[1:3] rep(x, 2) rep(as.POSIXlt(x), rep(2, 3))