[Rd] Question about selective importing of package functions...
murdoch.duncan at gmail.com
Mon Oct 21 00:43:13 CEST 2013
On 13-10-20 4:54 PM, Jonathan Greenberg wrote:
> Thanks -- learning something new today -- quick follow-up, will using
> the import statements in the NAMESPACE, when a user goes to
> install.packages(), auto-install the "dependent" packages the same way
> Depends forces?
You need to list the other packages in Imports instead of Depends; then
the answer is yes.
> On Sun, Oct 20, 2013 at 3:49 PM, Duncan Murdoch
> <murdoch.duncan at gmail.com <mailto:murdoch.duncan at gmail.com>> wrote:
> On 13-10-20 4:43 PM, Jonathan Greenberg wrote:
> I'm working on an update for my CRAN package "spatial.tools" and
> I noticed
> a new warning when running R CMD CHECK --as-cran:
> * checking CRAN incoming feasibility ... NOTE
> Maintainer: 'Jonathan Asher Greenberg
> <spatial-tools at estarcion.net <mailto:spatial-tools at estarcion.net>>'
> Depends: includes the non-default packages:
> 'sp' 'raster' 'rgdal' 'mmap' 'abind' 'parallel' 'foreach'
> 'doParallel' 'rgeos'
> Adding so many packages to the search path is excessive
> and importing selectively is preferable.
> Is this a warning that would need to be fixed pre-CRAN (not
> really sure
> how, since I need functions from all of those packages)? Is
> there a way to
> import only a single function from a package, if that function is a
> You really want to use imports. Those are defined in the NAMESPACE
> file; you can import everything from a package if you want, but the
> best style is in fact to just import exactly what you need. This is
> more robust than using Depends, and it doesn't add so much to the
> user's search path, so it's less likely to break something else
> (e.g. by putting a package on the path that masks some function the
> user already had there.)
> Duncan Murdoch
> Jonathan A. Greenberg, PhD
> Assistant Professor
> Global Environmental Analysis and Remote Sensing (GEARS) Laboratory
> Department of Geography and Geographic Information Science
> University of Illinois at Urbana-Champaign
> 259 Computing Applications Building, MC-150
> 605 East Springfield Avenue
> Champaign, IL 61820-6371
> Phone: 217-300-1924
> http://www.geog.illinois.edu/~jgrn/ <http://www.geog.illinois.edu/%7Ejgrn/>
> AIM: jgrn307, MSN: jgrn307 at hotmail.com <mailto:jgrn307 at hotmail.com>,
> Gchat: jgrn307, Skype: jgrn3007
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