spdep (version 0.4-9)

asMatrixCsrListw: Convert spatial weights list to CSR matrix form

Description

asMatrixCsrListw creates a matrix.csr from a listw object, asMatrixCsrIrW is a helper function used in fitting SAR models and elsewhere to make a (I - rho W) matrix.csr object from W; asListwMatrixCsr performs the reverse conversion from matrix.csr to listw object.

Usage

asMatrixCsrListw(listw, zero.policy=FALSE)
asMatrixCsrIrW(W, rho)
asMatrixCsrI(n)
asListwMatrixCsr(mcsr)

Arguments

listw

a listw object created for example by nb2listw

zero.policy

if TRUE assign zero to the lagged value of zones without neighbours, if FALSE (default) assume no cases of no neighbours - if they are in fact present, asMatrixCsrListw() will terminate with an error

W

a matrix.csr object created using asMatrixCsrListw from a listw object

rho

spatial regression coefficient

n

length of diagonal for identity matrix

mcsr

a matrix.csr object

Value

• asMatrixCsrListw and asMatrixCsrIrW return matrix.csr objects; asListwMatrixCsr returns a listw object

See Also

as.matrix.csr

Examples

require(SparseM)
data(oldcol)
COL.W <- nb2listw(COL.nb, style="W")
COL.W
image(asMatrixCsrListw(COL.W))