Add new method proximity

proximity.R

@@ -0,0 +1,29 @@
+library(data.table)
+
+#' Score the mean distance of genes to the telomeres across species.
+#'
+#' A score will be given to each gene such that 0.0 corresponds to the maximal
+#' mean distance across all genes and 1.0 corresponds to a distance of 0.
+#'
+#' The result will be a data.table with the following columns:
+#'
+#'  - `gene` Gene ID of the processed gene.
+#'  - `score` Score for the proximity.
+#'
+#' @param distances Distance data to use.
+#' @param species_ids Species, whose data should be included.
+#' @param gene_ids Genes to process.
+process_proximity <- function(distances, species_ids, gene_ids, ...) {
+    species_count <- length(species_ids)
+
+    # Prefilter distances by species.
+    distances <- distances[species %chin% species_ids]
+
+    # Compute the score as described above.
+
+    distances <- distances[, .(mean_distance = mean(distance)), by = "gene"]
+    max_distance <- distances[, max(mean_distance)]
+    distances[, score := 1 - mean_distance / max_distance]
+
+    distances[, .(gene, score)]
+}