warning: Parameter 2 to gmap_gmap() expected to be a reference, value given in /home/spatiala/public_html/book/includes/module.inc on line 497.

"Hi Tom. I have uploaded some comments on your book. You should check if you are able to run the code on upgraded versions of R. Otherwise fine, nice set of full-scale examples."

— Roger Bivand, Norwegian School of Economics and Business Administration