Nothing
#' Compute Absolute Clustering
#'
#' @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 absolute clustering. Leave missing to return a vector.
#'
#' @return a [tibble][tibble::tibble-package] or numeric vector if .name missing
#' @export
#'
#' @md
#' @concept clustering
#' @examples
#' data("de_county")
#' ds_abs_clust(de_county, c(pop_white, starts_with('pop_')))
#' ds_abs_clust(de_county, c(pop_white, starts_with('pop_')), 'abs_clust')
ds_abs_clust <- function(.data, .cols, .name){
if (!inherits(.data, 'sf')) {
stop('`ds_abs_clust` 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$.a <- calc_area(.data)
.c <- calc_c(.data)
.C <- sum(.c)
sub <- .data %>%
drop_sf() %>%
dplyr::select(!!.cols)
if (ncol(sub) <= 1) {
stop('`.cols` refers to a single column')
}
sub <- sub %>%
dplyr::rowwise() %>%
dplyr::mutate(.total = sum(dplyr::c_across(everything())),
.x = pick_n(1)) %>%
dplyr::ungroup()
.X <- sum(sub$.x)
.N <- nrow(sub)
.N2 <- .N^2
.xmat <- matrix(data = rep(sub %>% dplyr::pull(.data$.x), .N),
nrow = .N, ncol = .N, byrow = TRUE)
sub$.xvec <- rowSums(.c * .xmat)
.tmat <- matrix(data = rep(sub %>% dplyr::pull(.data$.total), .N),
nrow = .N, ncol = .N, byrow = TRUE)
sub$.tvec <- rowSums(.c * .tmat)
out <- sub %>%
dplyr::mutate(!!.name := (sum((.data$.x/.X * .data$.xvec) ) - (.X/.N2*.C))/
(sum((.data$.x/.X ) * .data$.tvec) - (.X/.N2*.C)) ) %>%
dplyr::pull(!!.name)
if (ret_t) {
.data %>% dplyr::mutate(!!.name := out) %>% relocate_sf()
} else {
out
}
}
#' @rdname ds_abs_clust
#' @param ... arguments to forward to ds_abs_clust from abs_clust
#' @export
abs_clust <- function(..., .data = dplyr::across(everything())) {
ds_abs_clust(.data = .data, ...)
}
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.