1. 2013-04-29 Re: [R-sig-Geo] zero out the dataframe? r-sig-geo Edzer Pebesma 2. 2013-04-29 Re: [R-sig-Geo] zero out the dataframe? r-sig-geo Michael Sumner 3. 2013-04-29 [R-sig-Geo] zero out the dataframe? r-sig-geo Philip A. Viton