[R-sig-Geo] problem assigning POSIX class to AttributeList column

Edzer J. Pebesma e.pebesma at geo.uu.nl
Fri Aug 25 09:54:11 CEST 2006

Mike, in reaction to 

on http://www.geog.uu.nl/~pebesma/sp_0.9-0.tar.gz  I prepared an sp 
version where the data slot for storing attribute data of classes 
SpatialPointsDataFrame, SpatialGridDataFrame and SpatialPixelsDataFrame 
is (again) a genuine data.frame (this used to the the AttributeList). 
There's little point in further developing the AttributeList class as 
the problems we had with the data.frame class -- excessive memory, disk 
and CPU usage for creating huge character row.names vectors, see e.g. 
the little example in the R-News 5/2 -- have been solved in R 2.4.0; see 

The upgrade to 2.4.0 seems to be binary incompatible for S4 objects, so 
that may be a good moment to make this binary incompatible change in sp 
(see https://stat.ethz.ch/pipermail/r-devel/2006-August/038811.html). In 
general, we do recommend sp users to always keep the scripts that 
generate or manipulate their data.

You, or others, may want to use it, along with R 2.3.1 or 2.4.0 to solve 
your current problem.

Best regards,

More information about the R-sig-Geo mailing list