#' sharlau_index_delta
#'
#' Computes the critical sharlau delta.
#'
#' @param t numeric Air temperature in degC.
#' @param rh numeric Relative humidity in percentage.
#' @return sharlau_index_delta
#'
#' @author Istituto per la Bioeconomia CNR Firenze Italy Alfonso Crisci \email{alfonso.crisci@@ibe.cnr.it}
#' @keywords sharlau_index_delta
#' @references Scharlau, K., 1950, Einfuhrung eines Schwulemasstabes und Abgrenzung von Schwulezonen durch Isohygrothermen, Erdkunde, 4, 188 201.
#' @export
#'
#'
#'
#'
sharlau_index_delta=function(t,rh) {
ct$assign("t", as.array(t))
ct$assign("rh", as.array(rh))
ct$eval("var res=[]; for(var i=0, len=t.length; i < len; i++){ res[i]=sharlau_index_delta(t[i],rh[i])};")
res=ct$get("res")
return(ifelse(res==9999,NA,res))
}
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