If a package is declared in Imports, it means that there must be some
kind of import expression in the NAMESPACE file. For example:
import(sp) # imports the whole sp package, probably NOT what you want
importFrom(sp, Polygon)? # import object Polygon from sp namespace
Theoretically, your import statement could import any of the sp
namespace objects, but it probably makes far more sense to import the
datasets from sp that you're using
On Mon, Jan 17, 2022, 11:11 Aur?lie Siberchicot
<aurelie.siberchicot at univ-lyon1.fr
<mailto:aurelie.siberchicot at univ-lyon1.fr>> wrote:
Hi,
I maintain the 'ade4' package which contains data with S4 objects
from
the package 'sp'.
Some functions of the 'sp' package are also used in examples in
some Rd
files (using the code -- if(requireNamespace("sp", quietly =
TRUE)) {} --).
In February 2020, I moved the 'sp' package from 'Suggests' to
'Imports'
according to an email received from Brian Ripley, because "At
least one
of the datasets cannot be loaded without a package declared in
Suggests:
-- typically this is because it loads a namespace defining S4
classes,
and such imports should be declared in Imports or (as Matrix does)
use a
.R wrapper."
For a few months, I have had the following NOTE:
* checking dependencies in R code ... NOTE
Namespace in Imports field not imported from: ?sp?
All declared Imports should be used.
In 'Writing R Extensions', I found: "Packages needed to use datasets
from the package should be in ?Imports?: this includes those
needed to
define S4 classes used."
Moving back 'sp' in 'Suggests' seems to solves the NOTE but is
contrary
to the recommendations of 'Writing R Extensions' and Brian Ripley.
I'm a bit confused to solve this note and the best way to declare the
dependency of 'ade4' to 'sp'.
Is anyone in my situation? Does anyone have any advice?
Thanks in advande for any help.
Cheers.
Aur?lie.
--
Aur?lie SIBERCHICOT
Ing?nieure en Ing?nierie Logicielle
04 72 44 85 98 - aurelie.siberchicot at univ-lyon1.fr
<mailto:aurelie.siberchicot at univ-lyon1.fr>
Laboratoire Biom?trie et Biologie Evolutive - UMR CNRS 5558
Universit? Claude Bernard - Lyon 1
B?timent Gr?gor Mendel, 43 boulevard du 11 novembre 1918
69622 Villeurbanne cedex
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