Dear forum,
I am working in R 2.9.1 and I am trying to sample locations from a network
file. Reading in nor plotting is a problem, however when I am trying to sample
from the file I get the following message:
nwlim<-readShapeLines("C:/Limburg_nwshape",
proj4string=CRS("+init=epsg:31300"))
plot(nwlim)
randacc<-spsample(nwlim,n=1000,"random")
Error in function (classes, fdef, mtable) :
unable to find an inherited method for function "coordinates", for signature
"numeric"
I found a similar error message in the archives, where prof. dr. Bivand
indicated to try to use readOGR instead of readShapeLines, however, I get the
same error message.
nwlim2<-readOGR("C:/Limburg_nwshape.shp", "Limburg_nwshape")
OGR data source with driver: ESRI Shapefile
Source: "C:/Limburg_nwshape.shp", layer: "Limburg_nwshape"
with 60745 rows and 24 columns
Feature type: wkbLineString with 2 dimensions
randacc<-spsample(nwlim2,n=1000,"random")
Error in function (classes, fdef, mtable) :
unable to find an inherited method for function "coordinates", for signature
"numeric"
Can anyone help me with this issue? The shape file in itself is not so large
(only a province was taken instead of the entire file of Belgium because of
memory issues), only 8.11Mb.
Thanks in advance!
Elke
__________________________________________
Elke Moons, PhD
Instituut voor Mobiliteit/Transportation Research Institute
Universiteit Hasselt
Wetenschapspark 5/Lokaal 1.10
3590 Diepenbeek
BELGIUM
Tel. +32-11-26.91.26
Fax +32-11-26.91.99
E-mail: elke.mo...@uhasselt.be
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
