Compare Adjacency Lists

Compare two adjacency lists and report edges that differ between them.

compare_adjacencies(adj1, adj2, shp, zero = TRUE)

Arguments

adj1

First adjacency list.

adj2

Second adjacency list.

shp

Optional sf object used to compute DE-9IM relations for differing pairs.

zero

Logical. TRUE when the adjacency lists are zero-indexed.

Value

tibble of differing edge pairs. When shp is supplied, includes DE-9IM relation and simple intersection class diagnostics.

Examples

data(towns)
rook <- adjacency(towns)
sf_rook <- lapply(sf::st_relate(towns, pattern = 'F***1****'), function(x) {
  x - 1L
})
#> although coordinates are longitude/latitude, st_relate_pattern assumes that
#> they are planar
compare_adjacencies(rook, sf_rook, zero = FALSE)
#> # A tibble: 0 × 5
#> # ℹ 5 variables: x <int>, y <dbl>, from <dbl>, relation <chr>, class <chr>