[R] regions in Gabriel graph

[Ondřej Mikula]

Dear list,

following the vignette of the package 'spacemmakeR' I have built a
gabriel graph of ten randomly placed points:

library(spdep)
set.seed(3)
xyir<-matrix(runif(20),10,2)
nbgab<-graph2nb(gabrielneigh(xyir), sym=TRUE)
plot(nbgab,xyir,points=FALSE)
points(xyir,pch=20,cex=2,col=c(2,4,4,4,2,2,4,2,4,4))
title(main="Gabriel Graph")

Now, I need to determine for any additional point whether it is
located within the region surrounded by links between identically
colored points. Would anybody give me a hint how to a achieve this?

Thanks in advance,
Ondřej Mikula



-- 
Ondřej Mikula

Institute of Animal Physiology and Genetics
Academy of Sciences of the Czech Republic
Veveri 97, 60200 Brno, Czech Republic

Institute of Vertebrate Biology
Academy of Sciences of the Czech Republic
Studenec 122, 67502 Konesin, Czech Republic