neighbour_idx {matricks}

Get all indices in neighbourhood

Description

Get all indices in neighbourhood

Usage

neighbour_idx(mat, idx, mask = NULL, diagonal = TRUE,
  include.idx = FALSE)

Arguments

mat

matrix or data.frame

idx

two-element vector

mask

logical matrix; optional

diagonal

include diagonal neighbours

include.idx

include current index

Examples

mat <- matrix(0, 3, 3)
neighbour_idx(mat, c(1, 2))
neighbour_idx(mat, c(1, 2), diagonal = FALSE)
neighbour_idx(mat, c(1, 2), diagonal = FALSE, include.idx = TRUE)
# With mask
mat <- matrix(0, 3, 4)
mask <- m(FALSE, FALSE, TRUE, TRUE |
          FALSE, FALSE, FALSE, FALSE |
          TRUE, TRUE, FALSE, TRUE)
neighbour_idx(mat, c(1, 2), mask = mask)