nb2nb_order: A function to order the elements og the m_i-subrrounds

In rominsal/spqdata: Testing for spatial structure of qualitative data in cross section

Description

An auxiliary function. In the case of obtaining the list of neighbors of class nb or poly2nb, it is necessary to reorder the elements based on distance and/or angle.

Usage

nb2nb_order(listw = listw, sf = sf)

Arguments

listw	an object of the nb class.
sf	the sf object used to get the listw .

Details

Sort the elements of a list nb. First by distance and

Value

An object of the nb class with the elements in order.

Author(s)

Fernando López	[e-mail]
Román Mínguez	[e-mail]
Antonio Páez	[e-mail]
Manuel Ruiz	[e-mail]

@references

• Ruiz, M., López, F., and Páez, A. (2010). A test for global and local homogeneity of categorical data based on spatial runs. Geographical Analysis.

See Also

dgp.spq, sp.runs.test, local.sp.runs.test

Examples

# With a sf object (irregular lattice)
library(sf)
fname <- system.file("shape/nc.shp", package="sf")
nc <- st_read(fname)
listw <- spdep::poly2nb(as(nc,"Spatial"), queen = FALSE)
listw.order <- nb2nb_order(listw = listw, sf = nc)

# With a sf object (regular lattice: hexagons)
sfc = st_sfc(st_polygon(list(rbind(c(0,0), c(1,0), c(1,1), c(0,1), c(0,0)))))
hexs <- st_make_grid(sfc, cellsize = 0.1, square = FALSE)
hexs.sf <- st_sf(hexs)
listw  <- poly2nb(as(hexs.sf, "Spatial"), queen = FALSE)
listw.order <- nb2nb_order(listw = listw, sf = hexs.sf)

rominsal/spqdata documentation built on Jan. 24, 2021, 11:11 a.m.