[Rspatial-devel] SpatialPointsNULL??

[Roger Bivand]

Hi:

getClass("SpatialPoints")
getClass("SpatialPixels")
getClass("SpatialGrid")

extend "SpatialPointsNULL", and

getClass("SpatialPolygons")
getClass("SpatialLines")

extend "SpatialPolygonsNULL" and "SpatialLinesNULL" respectively. Any 
ideas where the "*NULL" come from? None of them are declared by us, so are 
they coming from methods?

Roger

-- 
Roger Bivand
Department of Economics, NHH Norwegian School of Economics,
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