Neighbour Index for Adjacency Scoring — adjacency_neighbours • speed

Row positions of each row's ring neighbours, NA = no item

Usage

adjacency_neighbours(
  grid_index,
  n_rows,
  ring_dists = 1,
  ring_weights = 1,
  ring_type = c("manhattan", "chebyshev")
)

Arguments

grid_index: A list of indices from grid_indices().
n_rows: Number of rows.
ring_dists: A vector of positive integers, ring radii to score over. (default 1, i.e. only the immediate neighbourhood).
ring_weights: Per-ring weights aligned with ring_dists (default 1).
ring_type: Ring shape: "manhattan" (default; diamond ring) or "chebyshev" (square ring). See ring_offsets().

Value

Integer matrix with one row per row and one column per ring offset, with the offset weights in the weights attribute.