Convert neighbor or weights list to matrix

Given a nb list or weights list, convert them to a matrix.

Usage

wt_as_matrix(nb, wt)

nb_as_matrix(nb)

Arguments

nb

a neighbor list—i.e. as created by st_contiguity().

wt

a weights list—i.e. as created by st_weights()

Value

Returns a n x n matrix

Examples

# make a grid
g <- sf::st_make_grid(
  cellsize = c(10, 10),
  offset = c(0, 0),
  n = c(2, 2)
)

# create neighbors
nb <- st_contiguity(g)

# cast to matrix
nb_as_matrix(nb)
#>   [,1] [,2] [,3] [,4]
#> 1    0    1    1    1
#> 2    1    0    1    1
#> 3    1    1    0    1
#> 4    1    1    1    0
#> attr(,"call")
#> spdep::nb2mat(neighbours = nb, style = "B")

# create weights
wt <- st_weights(nb)

# cast as matrix
wt_as_matrix(nb, wt)
#>           [,1]      [,2]      [,3]      [,4]
#> [1,] 0.0000000 0.3333333 0.3333333 0.3333333
#> [2,] 0.3333333 0.0000000 0.3333333 0.3333333
#> [3,] 0.3333333 0.3333333 0.0000000 0.3333333
#> [4,] 0.3333333 0.3333333 0.3333333 0.0000000