```
#' Set levels of a factor to the order appeared in data
#'
#' @param x a factor
#'
#' @return a factor with levels in the order appeared in x.
#' @export
#'
#' @examples new_factor(factor(c("d","b","a","d")))
new_factor <- function(x){
if(!is.factor(x)){
stop('Please enter a factor!\n',
'You have provided an object of class: ', class(x)[1])
}
x <- factor(x, as.character(unique(x)))
x
}
#' Set levels of a factor to the reverse order appeared in data
#'
#' @param x a factor
#'
#' @return a factor with levels in the reverse order appeared in x.
#' @export
#'
#' @examples new_factor_rev(factor(c("a","b","c","a")))
new_factor_rev <- function(x){
if(!is.factor(x)){
stop('Please enter a factor!\n',
'You have provided an object of class: ', class(x)[1])
}
x <- factor(x, rev(as.character(unique(x))))
x
}
```

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