从权重列表对象spdep R中提取空间ids

Question

我使用mat2listw{spdep}创建了一个权重列表对象，稍后我将在空间回归中使用该对象。我想从这个权重列表对象中检索用于创建它的多边形的it。是否有可能从对象中恢复此信息？

下面是一个可重复的例子：

library(spdep)
library(UScensus2000tract)

# load data
  data("oregon.tract")

# get coordinates of centroids
  coords <- coordinates(oregon.tract)

# calculate a simple distance matrix between coordinates
  d <- dist(coords) 
  d <- as.matrix(d)

# Calculate Spatial weights Matrix (travel time)
  my_weights <- mat2listw(d, row.names = row.names(oregon.tract))

# Now I'd like to extract from my_weights the polygon ids

Answer 1

library(spdep)
library(UScensus2000tract)

# load data
  data("oregon.tract")

# get coordinates of centroids
  coords <- coordinates(oregon.tract)

# calculate a simple distance matrix between coordinates
  d <- dist(coords) 
  d <- as.matrix(d)

# Calculate Spatial weights Matrix (travel time)
  my_weights <- mat2listw(d, row.names = row.names(oregon.tract))

# Extract region ids from attributes of my_weights
region.ids <- attributes(my_weights)$region.id

head(region.ids)
[1] "oregon_0" "oregon_1" "oregon_2" "oregon_3" "oregon_4" "oregon_5"