help pages for CRS duplicated?
This does help, thank you. -Don
At 11:16 PM +0100 3/25/09, Roger Bivand wrote:
On Wed, 25 Mar 2009, Don MacQueen wrote:
I encountered the following. My quick and simple search of past emails in R-sig-geo didn't find any previous discussion.
search()
".GlobalEnv" "package:rmacq" "package:rgdal" "package:maptools" "package:sp" "package:foreign" "package:stats" "package:graphics" "package:grDevices" "package:utils" "package:datasets" "package:methods" "Autoloads" "package:base"
find('CRS')
[1] "package:sp"
?CRS
Help on topic 'CRS' was found in the following packages: Package Library rgdal /Library/Frameworks/R.framework/Resources/library sp /Library/Frameworks/R.framework/Resources/library Followed by a request to identify which one to view.
Since the behaviour of the class differs depending on whether rgdal is available or not, it is described (somewhat differently) in both. As it is, sp does not depend on rgdal but rgdal depends on sp, and this is likely to continue to be the case. Note that the specific versions can be accessed by: help(CRS, package=sp) help(CRS, package=rgdal) Further, the sp version uses examples depending on rgdal through require(), but sp does not "Suggest:" rgdal to avoid circularity. The difference, as the help pages explain, is that in just sp, there is no external check of the correctness of the string inserted into class instances, while when rgdal is loaded, the strings are checked using the PROJ.4 library. Hope this helps, Roger
Thanks -Don (In case anyone wonders, rmacq is a local personal package.)
sessionInfo()
R version 2.8.1 (2008-12-22) i386-apple-darwin8.11.1 locale: C attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] rmacq_1.0-2 rgdal_0.5-30 maptools_0.7-16 sp_0.9-28 foreign_0.8-30 loaded via a namespace (and not attached): [1] grid_2.8.1 lattice_0.17-17 tcltk_2.8.1 tools_2.8.1 Warning message: 'DESCRIPTION' file has 'Encoding' field and re-encoding is not possible
-- Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, 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
-------------------------------------- Don MacQueen Environmental Protection Department Lawrence Livermore National Laboratory Livermore, CA, USA 925-423-1062