#' Calculation of humidex.
#'
#' Calculation of humidex from temperature and relative humidity.
#'
#' @param tas vector of air temperature in degC.
#' @param hurs vector of relative humidity in \%.
#'
#' @return Humidex values in degC.
#' @author A.Casanueva (22.03.2018).
#' @details Formula based on air temperature and relative humidity, as it is calculated in Buzan 2015 GMD and references therein.
#'
#' @export
#'
#' @examples \dontrun{
#' # load the meteorological variables for example data in Salamanca:
#' data("data_obs")
#' hum <- humidex(data_obs$tasmean, hurs=data_obs$hurs)
#' }
#'
humidex <- function(tas,hurs){
# assertion statements
assertthat::assert_that(length(hurs)==length(tas), msg="Input vectors do not have the same length")
# Calculate vapour pressure in hPa
vp <- tashurs2vap.pres(tas, hurs)
# calculation of the humidex
result <- tas + 5/9 * (vp - 10)
return(result)
}
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