Include self in neighbours list
include.self.RdThe function includes the region itself in its own list of neighbours, and sets attribute "self.included" to TRUE; remove.self reverts the effects of include.self.
Value
The function returns an object of class nb with a list of integer vectors containing neighbour region number ids; attribute "self.included" is set to TRUE.
Author
Roger Bivand Roger.Bivand@nhh.no
Examples
columbus <- st_read(system.file("shapes/columbus.gpkg", package="spData")[1], quiet=TRUE)
col.gal.nb <- read.gal(system.file("weights/columbus.gal", package="spData")[1])
coords <- st_coordinates(st_centroid(columbus))
#> Warning: st_centroid assumes attributes are constant over geometries
summary(col.gal.nb, coords)
#> Neighbour list object:
#> Number of regions: 49
#> Number of nonzero links: 230
#> Percentage nonzero weights: 9.579342
#> Average number of links: 4.693878
#> Link number distribution:
#>
#> 2 3 4 5 6 7 8 9 10
#> 7 7 13 4 9 6 1 1 1
#> 7 least connected regions:
#> 1 6 31 39 42 46 47 with 2 links
#> 1 most connected region:
#> 20 with 10 links
summary(include.self(col.gal.nb), coords)
#> Neighbour list object:
#> Number of regions: 49
#> Number of nonzero links: 279
#> Percentage nonzero weights: 11.62016
#> Average number of links: 5.693878
#> Link number distribution:
#>
#> 3 4 5 6 7 8 9 10 11
#> 7 7 13 4 9 6 1 1 1
#> 7 least connected regions:
#> 1 6 31 39 42 46 47 with 3 links
#> 1 most connected region:
#> 20 with 11 links
summary(remove.self(include.self(col.gal.nb)), coords)
#> Neighbour list object:
#> Number of regions: 49
#> Number of nonzero links: 230
#> Percentage nonzero weights: 9.579342
#> Average number of links: 4.693878
#> Link number distribution:
#>
#> 2 3 4 5 6 7 8 9 10
#> 7 7 13 4 9 6 1 1 1
#> 7 least connected regions:
#> 1 6 31 39 42 46 47 with 2 links
#> 1 most connected region:
#> 20 with 10 links