Hi Barry, What do you mean with a broken OO model?
Best, Jacob. --- On Sat, 5/29/10, Barry Rowlingson <b.rowling...@lancaster.ac.uk> wrote: From: Barry Rowlingson <b.rowling...@lancaster.ac.uk> Subject: Re: [R-sig-Geo] projection() and proj4string() To: "Agustin Lobo" <alobolis...@gmail.com> Cc: r-sig-geo@stat.math.ethz.ch Date: Saturday, May 29, 2010, 7:10 PM On Sat, May 29, 2010 at 6:02 PM, Agustin Lobo <alobolis...@gmail.com> wrote: > > So, if I correctly understand, projection() can be used to retrieve > information > from an sp object but not to assign that info to a sp object: >> projection(a) > [1] "+proj=utm +zone=31 +ellps=intl +units=m +no_defs" > >> projection(a) <- projection(a) > Error in checkSlotAssignment(object, name, value) : > "crs" is not a slot in class "SpatialPoints" > Calls: projection<- -> @<- -> slot<- -> checkSlotAssignment Read the source. "projection" does a bunch of class tests (sure sign of a broken OO model), returning x...@crs for BasicRaster and x...@proj4string for Spatial classes. However, "projection<-" doesn't. It tries to assign to x...@crs whatever. Barry _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo [[alternative HTML version deleted]]
_______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
