sp
Thnaks a lot Prof. Bivand.
It works.Francesco
Il gioved? 16 maggio 2019, 15:47:36 CEST, Roger Bivand <Roger.Bivand at nhh.no> ha scritto:
On Thu, 16 May 2019, Francesco Perugini wrote:
Thanks a lot for the reply Prof. Bivand. It works fine now. Yes I did not use R since few months.I was wondering why this piece of coding left is not working: neighbors.knn1 <- knn2nb(knearneigh(coord, 1, longlat=F), sym=F)## Global G dlwknn1.B <- nb2listw(neighbors.knn1, style="B", zero.policy=TRUE) globalG.test(CRIME, dlwknn1.B, zero.policy=F)
Note that HTML always mangles code. You have not shown any errors apart from:
Error: object 'CRIME' not found
which is self-evident, as ls() in your workspace will show. You would always have needed columbus$CRIME to access CRIME. Roger
Thanks again for your help.Francesco ? ? Il gioved? 16 maggio 2019, 15:07:37 CEST, Roger Bivand <Roger.Bivand at nhh.no> ha scritto: Please post in plain text to avoid code mangling. You have not noticed that a lot has been happening. First, data sets from spdep have mostly been moved to spData. Next, spData mostly uses sf to read and format data. Finally you may also see changes as spdep model fitting functions are in spatialreg and will shortly be dropped from spdep. In your case:
library(sp) library(spdep)
Loading required package: spData Loading required package: sf Linking to GEOS 3.7.2, GDAL 3.0.0, PROJ 6.1.0
example(columbus)
colmbs> columbus <- st_read(system.file("shapes/columbus.shp",
package="spData")[1], quiet=TRUE)
colmbs> col.gal.nb <- read.gal(system.file("weights/columbus.gal",
package="spData")[1])
coord <- coordinates(columbus)
Error in (function (classes, fdef, mtable)? : ? unable to find an inherited method for function ?coordinates? for signature ?"sf"?
columbus <- as(columbus, "Spatial") coord <- coordinates(columbus)
Giving the full output, you can see that example(columbus) reads in the data and neighbours from spData, using sf. Consequently, you'd need to coerce columbus to an sp class if you do not want to upgrade your workflow to sf compatability. Hope this clarifies, Roger On Thu, 16 May 2019, Francesco Perugini via R-sig-Geo wrote:
Dear all,I'm not very familiar with R. I'm tying to use this code I've written months ago. At that time it was working but now it is not.
library(sp) library(spdep) example(columbus) coord <- coordinates(columbus)and get this message
Error in (function (classes, fdef, mtable)? : unable to find an inherited method for function ?coordinates? for signature ?"sf"? I've tried to also calllibrary(sf)but got the same error.I was wondering why? Thanks a lot.Francesco ??? [[alternative HTML version deleted]]
_______________________________________________ R-sig-Geo mailing list R-sig-Geo at r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
Roger Bivand Department of Economics, Norwegian School of Economics, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; e-mail: Roger.Bivand at nhh.no https://orcid.org/0000-0003-2392-6140 https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en [[alternative HTML version deleted]]