Background: OS: Linux Mandrake 10.1 release: R 2.0.0 editor: GNU Emacs 21.3.2 front-end: ESS 5.2.3 ---------------------------------
Colleagues Is there a function to calculate distances between adjacent latitude/ longitude pairs in a matrix? It is basically a spatial diff() function that I have in mind. Data: long1, lat1 long2, lat2 long3, lat3 looking for: diff(data$long, data$lat) function Result long1, lat1 long2, lat2, distance = long/lat2 - long/lat1 long3, lat3, distance = long/lat3 - long/lat2 I've probably missed it but a search of the maillist archives and quick scan of the packages (map*) did not solve my query. For this simple task I don't really want to get into GRASS. Best fishes Sam ---- Sam McClatchie, Sub-program leader, Pelagic Fisheries South Australian Aquatic Sciences Centre PO Box 120, Henley Beach 5022 Adelaide, South Australia email <[EMAIL PROTECTED]> Telephone: (61-8) 8207 5448 FAX: (61-8) 8200 2481 Research home page <http://www.members.iinet.net.au/~s.mcclatchie/> /\ ...>><xX(�> //// \\\\ <�)Xx><< ///// \\\\\\ ><(((�> >><(((�> ...>><xX(�>O<�)Xx><< ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
