Hi Roger,
I don't know what is happening, maybe a mismatch of some packages
from my R2.1 (old) install and my new R2.2 install, but I'm having
problems with function
asSpatialRingsShapes
that was used in the method you developed to import shapefiles into
files that are compatible with PBSmapping. The problem is not with
the functions you wrote for me, actually, but with a function that is
part of maptools. This is actually part of the example given in the
help file for asSpatialRingsShapes. R chokes on Sring:
> library(maptools)
> nc.shp <- read.shape(system.file("shapes/sids.shp",
package="maptools")[1])
Shapefile type: Polygon, (5), # of Shapes: 100
> nc1 <- asSpatialRingsShapes(nc.shp$Shapes, as.character(nc.shp
$att.data$FIPS))
Erreur : impossible de trouver la fonction "Sring"
Do others have problems with this function?
Sincerely,
Denis
Srings
2 messages · Denis Chabot, Roger Bivand
On Mon, 17 Oct 2005, Denis Chabot wrote:
Hi Roger, I don't know what is happening, maybe a mismatch of some packages from my R2.1 (old) install and my new R2.2 install, but I'm having problems with function asSpatialRingsShapes that was used in the method you developed to import shapefiles into files that are compatible with PBSmapping. The problem is not with the functions you wrote for me, actually, but with a function that is part of maptools. This is actually part of the example given in the help file for asSpatialRingsShapes. R chokes on Sring:
> library(maptools)
> nc.shp <- read.shape(system.file("shapes/sids.shp",
package="maptools")[1]) Shapefile type: Polygon, (5), # of Shapes: 100
> nc1 <- asSpatialRingsShapes(nc.shp$Shapes, as.character(nc.shp
$att.data$FIPS)) Erreur : impossible de trouver la fonction "Sring" Do others have problems with this function?
The name changed with a major improvement in the internal structure: the classes are (were/are) Sring|Polygon, Srings|Polygons, etc. Recent releases of maptools (since 0.5) depend on sp, and readShapePoly() now imports a shapefile into a SpatialPolygonsDataFrame object directly. We did announce the change, and the posting is available at: http://r-spatial.sourceforge.net/changes081.txt
where we also wrote:
"Following very useful input from users, a number of incompatible changes are being introduced into sp from release 0.8-*. We hope that users will export data objects in the deprecated formats before updating." Older versions of sp are available from the CRAN archive if needed. Hope this helps, Roger
Sincerely, Denis
Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: Roger.Bivand at nhh.no