#' Replicate Elements of Vectors and Lists
#'
#' A simplified version of rep for when you want to repeat
#' an input to a desired length. Introduced in 3.0.0 - this
#' function has a slight speed advantage compared to rep in
#' 3.0.0 but not here.
#'
#' @param x: a vector (of any mode including a list)
#' or a factor or (for rep only) a POSIXct or
#' POSIXlt or Date object; or an S4 object
#' containing such an object.
#'
#' @param length.out non-negative integer. The
#' desired length of the output vector. Other inputs
#' will be coerced to an integer vector and the first
#' element taken. Ignored if NA or invalid.
#'
#' @seealso \code{\link[base]{rep}}, \code{\link[base]{rep.int}}
#'
#' @export
rep_len <- function(x, length.out){
rep(x, length.out = length.out)
}
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