[R-sig-Geo] sp

[Francesco Perugini]

 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)

Error: object 'CRIME' not found 
Thanks again for your help.Francesco

    Il giovedì 16 maggio 2019, 15:07:37 CEST, Roger Bivand <Roger.Bivand using 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
>
>
>
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-- 
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 using nhh.no
https://orcid.org/0000-0003-2392-6140
https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en  
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