On Tue, 24 Aug 2010, Sabira el Messlaki wrote:
Dear list members,
I want to plot a neighbours list of class nb. I thought that the plot
would show 8 neighbour lines. But this is not the case for my plot. Did
I do something wrong?
col.knn2nb<-knn2nb(knearneigh(coords, k=8, longlat=F))
plot(coords, border="grey")
plot(col.knn2nb, coords, xlim=NULL, ylim=NULL, add=TRUE)
But:
table(card(col.knn2nb))
table(sapply(col.knn2nb, anyDuplicated))
table(sapply(1:length(col.knn2nb), function(i) i %in% col.knn2nb[i]))
show that each has eight unique neighbours, and that there are no
self-neighbours. So perhaps neighbours in the same direction have lines
that superimpose?
Roger
Thanks in advance
--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: roger.biv...@nhh.no
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