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oribatid
2006 Jul 19
0
connection network - influence of site
...ying to construct a distance matrix based on a nb object
created by spdep where sites must have a larger influence in one
direction then in the other.
Here is an example to better illustrate what I need:
Let say I have the following Gabriel connection network
library(spdep)
library(ade4)
data(orbatid)
nbgab<-graph2nb(gabrielneigh(as.matrix(oribatid$xy)))
plot(nbgab,oribatid$xy)
text(oribatid$xy,as.character(1:70),pos=1) # site number
arrows(-0.3,0,-0.3,10) # gradient direction
In that example, site 1 shouldn't influence site 2 (so it should have
a distance if 0 in the distance matri...