[R-sig-Geo] Question on symmetric for nb2mat

[Roger Bivand]

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On Wed, 29 Jul 2020, Andrea Gilardi wrote:

> Dear all, probably I'm missing something obvious but I have a question on
> the matrix built using nb2mat with argument style = "B". More precisely, I
> don't understand why the following code says that the matrix *W* (which
> should be a binary first-order adjacency matrix) is not symmetric:
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> *library(spdep)library(rgdal)library(Matrix)# datanc.sids <-
> readOGR(system.file("shapes/sids.shp", package = "spData"))adj <-
> poly2nb(nc.sids)W <- as(nb2mat(adj, style = "B"),
> "Matrix")Matrix::isSymmetric(W)#> [1] FALSEchol(W)#> Error in
> asMethod(object): not a symmetric matrix; consider forceSymmetric() or
> symmpart()*
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> Kind regards
> Andrea
>
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-- 
Roger Bivand
Department of Economics, Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; e-mail: Roger.Bivand using nhh.no
https://orcid.org/0000-0003-2392-6140
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