[R-sig-Geo] Error in print(data.frame) & zero.policy

[Zz]

Dear spdep users,



I tried to follow below command to create a neighborhood list.   The
data "Matrix.txt"
is enclosed


> mat0 <- read.table("Matrix.txt", header=FALSE, sep="\t", fill=TRUE)
> mat <- as.matrix(mat0)
> dim(mat)
[1] 46 46
> summary(c(mat))
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max.    NA's
      1       1       1       1       1       1    1918
> mat[is.na(mat)] <- 0
> summary(c(mat))
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
0.00000 0.00000 0.00000 0.09357 0.00000 1.00000
> lw <- mat2listw(mat, style="B")
Warning message:
In nb2listw(res$neighbours, glist = res$weights, style = style,  :
  zero sum general weights
> summary(lw)
Characteristics of weights list object:
Neighbour list object:
Number of regions: 46
Number of nonzero links: 198
Percentage nonzero weights: 9.357278
Average number of links: 4.304348
2 regions with no links:
2 18
Link number distribution:

 0  2  3  4  5  6  7  8
 2  5  5 14  8  9  1  2
5 least connected regions:
7 8 9 36 41 with 2 links
2 most connected regions:
24 38 with 8 links

Weights style: B
Weights constants summary:
Error in print(data.frame(rbind(unlist(spweights.constants(object,
zero.policy = zero.policy))[c(1,  :
  error in evaluating the argument 'x' in selecting a method for function
'print': Error in spweights.constants(object, zero.policy = zero.policy) :
  regions with no neighbours found
> is.symmetric.nb(lw$neighbours)
[1] TRUE



The neighborhood list cannot be used in spatial regression.    The main
error seems to be "Error in
print(data.frame(rbind(unlist(spweights.constants(object, zero.policy =
zero.policy))[c(1,  :
  error in evaluating the argument 'x' in selecting a method for function
'print': Error in spweights.constants(object, zero.policy = zero.policy) :
  regions with no neighbours found"


Is there anyone know what wrong with the data?  Thanks




Happy Easter
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