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#' Compute Distance Decay Isolation
#'
#' @param .data [tibble][tibble::tibble-package] with sf geometry
#' @param .cols [`tidy-select`](https://tidyselect.r-lib.org/reference/language.html)
#' Columns to compute the measure with. Must be at least 2 columns. If more than 2, treats
#' first column as first group and sum of other columns as second.
#' @param .name name for column with distance decay isolation. Leave missing to return a vector.
#' @param .comp Default is FALSE. FALSE returns the sum, TRUE returns the components.
#'
#' @return a [tibble][tibble::tibble-package] or numeric vector if .name missing
#' @export
#'
#' @md
#' @concept clustering
#' @examples
#' data("de_county")
#' ds_dd_isolation(de_county, c(pop_black, starts_with('pop_')))
#' ds_dd_isolation(de_county, c(pop_black, starts_with('pop_')), 'dd_isolation')
ds_dd_isolation <- function(.data, .cols, .name, .comp = FALSE){
if (!inherits(.data, 'sf')) {
stop('`ds_dd_isolation` requires `.data` to inherit sf for calculating areas.')
}
.cols <- rlang::enquo(.cols)
if (missing(.name)) {
.name <- 'v_index'
ret_t <- FALSE
} else {
ret_t <- TRUE
}
.data$.a <- calc_area(.data)
sub <- .data %>%
drop_sf() %>%
dplyr::select(!!.cols)
if (ncol(sub) <= 1) {
stop('`.cols` refers to a single column')
}
sub <- sub %>%
dplyr::rowwise() %>%
dplyr::mutate(.total = sum(dplyr::c_across(everything())),
.x = pick_n(1),
.y = .data$.total - .data$.x) %>%
dplyr::ungroup()
.X <- sum(sub$.x)
.Y <- sum(sub$.y)
.k <- calc_k(.data, sub[['.total']])
.sum_kxt <- sum((.k * sub[['.x']])/sub[['.total']], na.rm = TRUE)
out <- sub %>%
rowwise_if(.comp) %>%
dplyr::mutate(!!.name := sum((.data$.x/.X)*.sum_kxt)) %>%
dplyr::pull(!!.name)
if (ret_t) {
.data %>% dplyr::mutate(!!.name := out) %>% relocate_sf()
} else {
out
}
}
#' @rdname ds_dd_isolation
#' @param ... arguments to forward to ds_dd_isolation from dd_isolation
#' @export
dd_isolation <- function(..., .data = dplyr::across(everything())) {
ds_dd_isolation(.data = .data, ...)
}
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