[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.
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