r - 从权重列表对象 spdep R 中提取空间 ID

Question

我曾经mat2listw{spdep}创建一个权重列表对象，稍后将在空间回归中使用该对象。我想从此权重列表对象中检索用于创建它的多边形的 ID。是否可以从对象中恢复此信息？

这是一个可重现的示例：

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"