R/na.roughfix.R

In quantregForest: Quantile Regression Forests

na.roughfix <- function(object, ...)
  UseMethod("na.roughfix")

na.roughfix.data.frame <- function(object, ...) {
  isfac <- sapply(object, is.factor)
  isnum <- sapply(object, is.numeric)
  if (any(!(isfac | isnum)))
      stop("na.roughfix only works for numeric or factor")
  roughfix <- function(x) {
      if (any(is.na(x))) {
          if (is.factor(x)) {
              freq <- table(x)
              x[is.na(x)] <- names(freq)[which.max(freq)]
          } else {
              x[is.na(x)] <- median(x, na.rm=TRUE)
          }
      }
      x
  }
  object[] <- lapply(object, roughfix)
  object
}

na.roughfix.default <- function(object, ...) {
  if (!is.atomic(object))
    return(object)
  d <- dim(object)
  if (length(d) > 2)
    stop("can't handle objects with more than two dimensions")
  if (all(!is.na(object)))
    return(object)
  if (!is.numeric(object))
    stop("roughfix can only deal with numeric data.")
  if (length(d) == 2) {
      hasNA <- which(apply(object, 2, function(x) any(is.na(x))))
      for (j in hasNA)
          object[is.na(object[, j]), j] <- median(object[, j], na.rm=TRUE)
  } else {
      object[is.na(object)] <- median(object, na.rm=TRUE)
  }
  object
}