#' Bind two factors
#'
#' Creates a new factor from two existing factors, where the new factor's
#' levels are the union of the levels of the input factors
#'
#' @param a factor
#' @param b factor
#'
#' @return factor
#' @export
#' @examples
#' fbind(factor(letters[1:3]),factor(letters[26:24]))
fbind<-function(a,b){
factor(c(as.character(a), as.character(b)))
}
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