new version of print.factor

[A.J. Rossini]

Thanks to Tony Plate for letting me know what the abbreviate.arg
option does.  I think this could be made more flexible (I.e. 
 =TRUE, =FALSE, =#, where # would be passed to the abbreviate
min.length argument).  But it follows the example I was given.

"print.factor" <- 
  function (x, quote = FALSE, max.levels=5, print.levels = {if
(max.levels==0) FALSE else TRUE}, abbreviate.arg=FALSE, ...)
{ 
  if (length(x) <= 0) 
    cat("factor(0)\n") 
  else print(as.character(x), quote = quote, ...) 
  if (print.levels) {
    if (abbreviate.arg) {
      cat("Levels: ", paste(abbreviate(levels(x)[1:max.levels]),
                            collapse = " "), "\n")
    } else {
      cat("Levels: ", paste(levels(x)[1:max.levels],
                            collapse = " "), "\n")
    }
  }
  invisible(x) 
} 
 

It definitely could be cleaned up a bit more.

best,
-tony

-- 
A.J. Rossini				Rsrch. Asst. Prof. of Biostatistics
U. of Washington Biostatistics		rossini@u.washington.edu	
FHCRC/SCHARP/HIV Vaccine Trials Net	rossini@scharp.org
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