[R-sig-Geo] input shapefile to build graph-using R

[silverlining]

> # Load libraries
> library(spdep)
> library(igraph)
> library(maptools)
> pl <- readShapeLines("H:/data/Beijing_NatrualRoads.shp",
+ proj4string=CRS("+proj=Mercator_Auxiliary_Sphere +datum=WGS84"))
> pt <- readShapePoints("H:/data/Beijing_NatrualRoads_computejunctions.shp",
+ proj4string=CRS("+proj=Mercator_Auxiliary_Sphere +datum=WGS84"))
> g <- graph.data.frame(pl, directed=TRUE, vertices=pt)
Error in graph.data.frame(pl, directed = TRUE, vertices = pt) : 
  Duplicate vertex names
In addition: Warning message:
In graph.data.frame(pl, directed = TRUE, vertices = pt) :
  In `d' `NA' elements were replaced with string "NA"
> cl<-closeness(g, mode = c("out"),weights = NULL, normalized = TRUE)
Error in match(x, table, nomatch = 0L) : object 'g' not found
> 
<http://r-sig-geo.2731867.n2.nabble.com/file/n7587719/R_error.jpg> 



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