I think rgl should be in Depends. You are providing a method for a generic function from another package. In order to use your method, you want the user to be able to call the generic function without scoping (i.e. without calling rgl::plot3d), so the generic should be on the search path, so the package that provides it should be listed in Depends in the NAMESPACE file.
Martyn On Fri, 2013-08-23 at 22:01 -0600, Gavin Simpson wrote: > Dear List, > > In one of my packages I have an S3 method for the plot3d generic > function from package rgl. I am trying to streamline my Depends > entries but don't know how to have > > plot3d(foo) > > in the examples section for the plot3d method in my package, without > rgl being in Depends. > > Note that I importFrom(rgl, plotd3d) and register my S3 method via > S3Method() in the NAMESPACE. > > If rgl is not in Depends but in Imports, I see this when checking the package > > > ## 3D plot of data with curve superimposed > > plot3d(aber.pc, abernethy2) > Error: could not find function "plot3d" > > I presume this is because rgl's namespace is only loaded but the > package is not attached to the search path. > > Writing R extensions indicates that one can export from a namespace > something that was imported from another package namespace. I thought > that might help the situation, and now the code doesn't raise an > error, I get > > * checking for missing documentation entries ... WARNING > Undocumented code objects: > ‘plot3d’ > All user-level objects in a package should have documentation entries. > See the chapter ‘Writing R documentation files’ in the ‘Writing R > Extensions’ manual. > > as I don't document plot3d() itself. > > What is the recommended combination of Depends and Imports plus > NAMESPACE directives etc that one should use in this situation? Or am > I missing something else? > > I have a similar issue with my package including an S3 method for a > generic in the lattice package, so if possible I could get rid of both > of these from Depends if I can solve the above issue. > > Thanks in advance. > > Gavin > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
