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-to...@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
dependency?
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
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