#' diffusivity
#'
#' Calculate air diffusivity.
#'
#' @param tk numeric Air temperature in degK.
#' @param pair numeric Air pressure in hPa.
#' @return diffusivity
#'
#'
#' @author Istituto per la Bioeconomia CNR Firenze Italy Alfonso Crisci \email{alfonso.crisci@@ibe.cnr.it}
#'
#' @export
#'
#'
#'
#'
diffusivity=function(tk,pair) {
ct$assign("tk", as.array(tk))
ct$assign("pair", as.array(pair))
ct$eval("var res=[]; for(var i=0, len=tk.length; i < len; i++){ res[i]=diffusivity(tk[i],pair[i])};")
res=ct$get("res")
return(ifelse(res==9999,NA,res))
}
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