问Roxygen2:用可选参数记录函数

EN

#' @name dbh2vol
#' @usage dbh2vol(dbh,ipft)
#' @description This is an allometric function to return the tree volume
#' @param dbh diameter at breast height
#' @param ipft PFT
#'
#' @param chambers  optional parameter that is blah-blah... FALSE by default
#' @param hgt  function to do this and that (optional).
#'             If not provided, \code{other_function(dbh, ipft)} is used.
#'
#' @return vol volume
#' @export

dbh2vol <- function(dbh,ipft,...,hgt, chambers = FALSE){

  if (missing(hgt)) hgt = other_function (dbh, ipft)
  vol  = hgt * dbh ^ pft$vol[ipft]
  if (chambers) vol = vol * 2

  return(vol)
}