mat2listw

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Convert a square spatial weights matrix to a weights list object

The function converts a square spatial weights matrix, optionally a sparse matrix to a weights list object, optionally adding region IDs from the row names of the matrix, as a sequence of numbers 1:nrow(x), or as given as an argument. The style can be imposed by rebuilting the weights list object internally.

Keywords
spatial
Usage
mat2listw(x, row.names = NULL, style="M")
Arguments
x
A square non-negative matrix with no NAs representing spatial weights; may be a matrix of class “sparseMatrix”
row.names
row names to use for region IDs
style
default "M", unknown style; if not "M", passed to nb2listw to re-build the object
Value

A listw object with the following members:

See Also

nb2listw, nb2mat

Aliases
  • mat2listw
Examples
example(columbus)
coords <- coordinates(columbus)
col005 <- dnearneigh(coords, 0, 0.5, attr(col.gal.nb, "region.id"))
summary(col005)
col005.w.mat <- nb2mat(col005, zero.policy=TRUE)
col005.w.b <- mat2listw(col005.w.mat)
summary(col005.w.b$neighbours)
diffnb(col005, col005.w.b$neighbours)
col005.w.mat.3T <- kronecker(diag(3), col005.w.mat)
col005.w.b.3T <- mat2listw(col005.w.mat.3T, style="W")
summary(col005.w.b.3T$neighbours)
W <- as(nb2listw(col005, style="W", zero.policy=TRUE), "CsparseMatrix")
col005.spM <- mat2listw(W)
summary(col005.spM$neighbours)
diffnb(col005, col005.spM$neighbours)
IW <- kronecker(Diagonal(3), W)
col005.spM.3T <- mat2listw(IW, style="W")
summary(col005.spM.3T$neighbours)
Documentation reproduced from package spdep, version 0.6-9, License: GPL (>= 2)

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