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###############################################################################
# Emir: EmiR: Evolutionary minimization forR #
# Copyright (C) 2021 Davide Pagano & Lorenzo Sostero #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# any later version. #
# #
# This program is distributed in the hope that it will be useful, but #
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY #
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License #
# for more details: <https://www.gnu.org/licenses/>. #
###############################################################################
#' Constraint for minimization
#'
#' Create a constraint function for constrained optimization. Only inequality constraints are
#' supported.
#'
#' @param func function describing the constraint.
#' @param inequality inequality type. Possible values: `>`, `>=`, `<=`, `<`.
#' @return `constraint` returns an object of class `Constraint`.
#' @export
#'
#' @examples
#' g1 <- function(x) 0.0193*x[3] - (x[1]*0.0625)
#' c1 <- constraint(g1, "<=")
#'
constraint <- function(func, inequality) {
stopifnot(inequality == ">" || inequality == ">=" || inequality == "<=" || inequality == "<")
new("Constraint", func=func, inequality=inequality)
}
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