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#' Rescale coords of TSP instance to \eqn{[0,1]^2}.
#'
#' @param x [\code{\link{tsp_instance}}]\cr
#' TSP instance.
#' @param coords [\code{matrix}]\cr
#' Numeric matrix of city coordinates,
#' rows denote cities.
#' @return [\code{matrix}] for \code{rescale_coords} and \code{tsp_instance} for \code{rescale_instance}.
#' Numeric matrix of scaled city coordinates.
#' @export
rescale_instance = function(x) {
assertClass(x, "tsp_instance")
x$coords = rescale_coords(x$coords)
x$dists = as.matrix(dist(x$coords))
return(x)
}
#' @export
#' @rdname rescale_instance
rescale_coords = function(coords) {
min = apply(coords, 2, min)
max = apply(coords, 2, max)
t((t(coords) - min) / (max - min))
}
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