I never thought about duplicates. I have several identical x and y coordinates for different transactions in an office building. That is why there is no line( some sort of self neighbour), however not exactly. Thank you very much.
-----Oorspronkelijk bericht----- Van: Roger Bivand [mailto:roger.biv...@nhh.no] Verzonden: di 24-8-2010 17:52 Aan: Sabira el Messlaki CC: r-sig-geo@stat.math.ethz.ch Onderwerp: Re: [R-sig-Geo] knn2nb 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 [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
