Mike, in reaction to https://stat.ethz.ch/pipermail/r-sig-geo/2006-July/001189.html
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 https://stat.ethz.ch/pipermail/r-devel/2006-April/037306.html 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, -- Edzer _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
