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#' Warmest month of the year
#'
#' @description Calculates the mean temperature of the warmest month of the year
#' @param mx vector of daily maximum temperature series.
#' @param dates vector of dates corresponding with daily temperature series
#' @param type type of output. It can be "temp" for temperature or "month" for the number of the warmest month.
#' @param ... any other argument. It is expected to be "na.rm" in case NA values are required to be removed.
#' @return Depending on argument type, the output will be a numeric value with the month (type = "month") or with temperature (type = "temp").
#'
#' @examples
#'
#'
#' warmMonth(mx = daily_tmax,
#' dates = seq.Date(as.Date('1981-01-01'),
#' as.Date('2010-12-31'), by ='day'),
#' type = 'temp',
#' na.rm = TRUE)
#'
#' @export
warmMonth <- function(mx, dates, type = 'temp', ...){
if(all(is.na(mx))){
z <- NA
} else{
ag <- aggregate(mx, by = list(substr(dates, 1, 7)), FUN = 'mean', ...)
ag <- aggregate(ag[, 2], by = list(substr(ag[, 1], 6, 7)), FUN = 'mean', ...)
if(type == 'temp') z <- max(ag[, 2])
if(type == 'month') z <- which.max(ag[, 2])
}
return(z)
}
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