[R] R function to convert a number to text

[Jim Lemon]

lin tang wrote:
> hi, Dear R users -
> 
> I wonder is there a written R function to convert a number to a text, say convert 1 to "one" , 100  to "one hundred". I know in xls. has such a function BAHTTEXT, does anybody know is there a similar function in R ? Thanks.
> 
Hi Lin,
I got bored after the millions, but this should handle the smaller 
numbers, and you can always extend it.

digits2text<-function(x,mult="") {
  units<-c("one","two","three","four","five",
   "six","seven","eight","nine")
  teens<-c("ten","eleven","twelve","thirteen","fourteen",
   "fifteen","sixteen","seventeen","eighteen","nineteen")
  tens<-c("ten","twenty","thirty","forty","fifty",
   "sixty","seventy","eighty","ninety")
  digits<-rev(as.numeric(strsplit(as.character(x),"")[[1]]))
  digilen<-length(digits)
  if(digilen == 2 && digits[2] == 1) return(teens[digits[1]+1])
  digitext<-units[digits[1]]
  if(digilen > 1) digitext<-c(digitext,tens[digits[2]])
  if(digilen > 2) digitext<-c(digitext,"hundred",units[digits[3]])
  if(digilen > 3) digitext<-
   c(digitext,digits2text(floor(x/1000),"thousand"))
  if(digilen > 6) digitext<-
   c(digitext,digits2text(floor(x/1000000),"million"))
  return(paste(c(rev(digitext),mult),sep="",collapse=" "))
}

Jim