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#' @include internal.R pproto.R ProjectProblem-proto.R
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#' Weights
#'
#' Weights are used to specify the relative importance for specific
#' features persisting into the future. Please note that only some
#' objectives require weights, and attempting to solve a problem that does not
#' require weights will throw a warning and the weights will be ignored.
#'
#' @details Currently, only one function can be used to specify weights:
#'
#' \describe{
#'
#' \item{[add_feature_weights()]}{
#' Set feature weights for a project prioritization [problem()].}
#'
#' }
#'
#' @seealso [constraints], [decisions],
#' [objectives], [problem()],
#' [solvers], [targets].
#'
#' @examples
#' # load data
#' data(sim_projects, sim_features, sim_actions)
#'
#' # build problem with maximum richness objective, $300 budget, and
#' # feature weights
#' p <- problem(sim_projects, sim_actions, sim_features,
#' "name", "success", "name", "cost", "name") %>%
#' add_max_richness_objective(budget = 200) %>%
#' add_feature_weights("weight") %>%
#' add_binary_decisions()
#'
#' \dontrun{
#' # solve problem
#' s <- solve(p)
#'
#' # print solution
#' print(s)
#'
#' # plot solution
#' plot(p, s)
#' }
#' @name weights
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