#' heat_index
#'
#' Calculate the heat index following the NOAA scheme.
#'
#' @param t numeric Air temperature in degC.
#' @param rh numeric Relative humidity in percentage.
#' @return heat index in degC.
#'
#'
#' @author Istituto per la Bioeconomia CNR Firenze Italy Alfonso Crisci \email{alfonso.crisci@@ibe.cnr.it}
#' @keywords NOAA heat index
#' @references NOAA index from George Winterling based on SteadMan's work "The Assessment of Sultriness. Part I: A Temperature-Humidity Index Based on Human Physiology and Clothing Science, R. G. Steadman, Journal of Applied Meteorology, July 1979, Vol 18 No7, pp 861 873.
#' @export
#'
#'
heat_index=function(t,rh) {
ct$assign("t", as.array(t))
ct$assign("rh", as.array(rh))
ct$eval("var res=[]; for(var i=0, len=t.length; i < len; i++){ res[i]=heatindex(t[i],rh[i])};")
res=ct$get("res")
return(ifelse(res==9999,NA,res))
}
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