#' @title Jones Model
#' @name jones_model
#' @description Quantifies the chill accumulation by means of converting temperatures to exponential units temperature.
#' @param x Vector containing temperature values (Celsius-degree).
#' @param total TRUE Shows the total value of accumulation, FALSE shows the value of chill for each temperature (TRUE is default).
#' @return The function returns values the chill for each temperature of vector (Total = FALSE), or returns the chill accumulation (Total = TRUE).
#' @examples
#'
#' x <- rnorm(500, 8, 5)
#' jones_model(x)
#' jones_model(x, FALSE)
#'
#' @references
#'
#' JONES, H. G., HILLIS, R. M., GORDON, S. L., and BRENNAN, R. M. (2013). An approach to the determination of winter chill requirements for different Ribes cultivars. Plant. Biol.
#'
#' @importFrom utils tail
#' @export
jones_model <- function(x, total=TRUE){
y <- rep(0, length(x))
y <- 0.6702*exp(-0.148*x)
if (total==TRUE)
return(tail(cumsum(y),n=1))
else return(y)
}
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