spdep (version 0.5-3)

trW: Spatial weights matrix powers traces

Description

The function is used to prepare a vector of traces of pwers of a spatial weights matrix

Usage

trW(W, m = 100, p = 50, type = "mult")

Arguments

W

A spatial weights matrix in CsparseMatrix form

m

The number of powers

p

The number of samples used in Monte Carlo simulation of the traces if type is MC

type

Either mult (default) for powering a sparse matrix, or MC for Monte Carlo simulation of the traces

Value

• A numeric vector of m traces.

References

LeSage J and RK Pace (2009) Introduction to Spatial Econometrics. CRC Press, Boca Raton, pp. 96--105.

See Also

as_dgRMatrix_listw, nb2listw

Examples

example(columbus)
listw <- nb2listw(col.gal.nb)
W <- as(as_dgRMatrix_listw(listw), "CsparseMatrix")
trMat <- trW(W, type="mult")
str(trMat)
trMC <- trW(W, type="MC")
str(trMC)
plot(trMat, trMC)