globalG.test - routine with distance based neighbours

Dear all,
I've routine that plot Glogal G statistics at different k-neighbours. I've
tried to run it using distance based neighbours method but I got this
message:

Error in dnb[[val]] : subscript out of bounds
val is defined in for (val in z), and z in z <- c(620, 650, 700) - 
arguably should be c(0.620, 0.650, 0.700) given all.linkedT as 0.619. 
There is no dnb[[620]], it is length(dnb) == length(z) long.

Roger
Any suggestion on this?

Thanks a lot.

franc.per

_______________

this is the routine

library(spdep)
example(columbus)
coord <- coordinates(columbus)

#k-nearest neighbours
#z <- c(1:20)
#neighbors.knn <- list()

#Distance-based neighbours
k1 <- knn2nb(knearneigh(coord,k=1,longlat=F))
all.linkedT <- max(unlist(nbdists(k1, coord,longlat=F)))
all.linkedT

z <- c(620, 650, 700)
dnb <- list()
for (val in z)
 {
 dnb <- c(dnb, list(dnearneigh(coord, 0, val, longlat=F)))
# neighbors.knn <- c(neighbors.knn, list(knn2nb(knearneigh(coord, val,
longlat=F), sym=F)))
 }
list(dnb)

ndists <- length(z)
ZG <- vector(mode="list", length=ndists)
names(ZG) <- as.character(z)

f <- c("CRIME", "INC")
for (val in z)
 {
# dlwknn.B <- nb2listw(neighbors.knn[[val]], style="B", zero.policy=TRUE)
 dlwdnb.B <- nb2listw(dnb[[val]], style="B", zero.policy=TRUE)
 temp <- list()

 for (var in f)
 {
#   temp <- c(temp, list(globalG.test(columbus[[var]], dlwknn.B,
zero.policy=F)))
   temp <- c(temp, list(globalG.test(columbus[[var]], dlwdnb.B,
zero.policy=F)))
 }
 ZG[[val]] <- temp
}

t(sapply(lapply(ZG, "[[", 1), function(var) c(var$estimate[1],
                                     var$statistic,
p.value=unname(var$p.value))))
CRIME <- t(sapply(lapply(ZG, "[[", 1), function(var) c(var$estimate[1],
                                     var$statistic,
p.value=unname(var$p.value))))
plot(z, CRIME[,1], xlab="distance", ylab="Global G", xlim=NULL,
axes=TRUE, type="o", col="blue")

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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; fax +47 55 95 91 00
e-mail: Roger.Bivand at nhh.no
http://orcid.org/0000-0003-2392-6140
https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en
http://depsy.org/person/434412

globalG.test - routine with distance based neighbours

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