#' Modified exponential function with upper bound
#'
#' @param x Point to evaluate modified exponential function and gradient
#' @param upper.limit Lower limit of the modified exponential function; defaults to 0
#'
#' @details
#' Evaluates the modified exponential function (-exp(x) + upper.bound) and its gradient (-exp(x)).
#'
#' @return Returns a list with two elements, each with the same number of elements as x
#' \item{value}{Value of the modified exponential function at x}
#' \item{gradient}{Value of the gradient of the modified exponential function at x}
#'
#' @examples
#' x <- seq(-5, 5, length.out = 100)
#' exp.result <- modified.exp.upper(x)
#'
#' plot(exp.result$value ~ x, type = "l")
#' plot(exp.result$gradient ~ x, type = "l")
#'
#' @export
modified.exp.upper <-
function(x, upper.limit = 0){
return(list(value = -exp(x) + upper.limit,
gradient = -exp(x)))
}
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