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#' @title The frequency of words
#' @description This function returns the frequency of words
#' @param x a vector of words
#' @return The frequency of words
#' @author Qin wenfeng
#' @examples
#' freq(c("a","a","c"))
#' @export
freq <- function(x){
if("character" %in% class(x) != TRUE){
stop("Please give me a character vector.")
}
if(.Platform$OS.type=="windows"){
x=enc2utf8(x)
}
res = words_freq(x)
s = data.frame(char=attr(res,"names"),freq=as.numeric(res),stringsAsFactors = F)
if(.Platform$OS.type=="windows"){
Encoding(s$char) = "UTF-8"
}
return(s)
}
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