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#' Replace Missing Values
#'
#' Replace missing values
#'
#' This is a convenience function that is the same as x[is.na(x)] <- replace
#'
#' @param x vector possibly containing missing (\code{NA}) values
#' @param replace either a scalar replacement value, or a function returning a
#' scalar value
#' @param ... Optional arguments to be passed to \code{replace}
#' @return Vector with missing values (\code{NA}) replaced by the value of
#' \code{replace}.
#' @author Gregory R. Warnes \email{greg@@warnes.net}
#' @seealso \code{\link[base]{is.na}}, \code{\link[stats]{na.omit}}
#' @keywords manip
#' @examples
#'
#' x <- c(1, 2, 3, NA, 6, 7, 8, NA, NA)
#'
#' # Replace with a specified value
#' na.replace(x, "999")
#'
#' # Replace with the calculated median
#' na.replace(x, median, na.rm = TRUE)
#' @export
na.replace <- function(x, replace, ...) {
if (is.function(replace)) {
replace <- replace(x, ...)
}
x[is.na(x)] <- replace
x
}
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