Jeffrey J. Hallman wrote:
I am the maintainer of the 'tis' package. One of the functions in my package
is 'nberShade'. A user wants to make nberShade generic, with the old version
renamed as nberShade.default, all of which is fine with me. And he wants to
add a new method, nberShade.ggplot, which works for objects of class ggplot.
He also wants to add a method fortify.tis for the generic fortify defined in
ggplot2.
The nberShade.ggplot method uses a bunch of other functions from the ggplot2
package, and it's first line is
require("ggplot2")
From what he tells me, this function works.
Where I'm having trouble is figuring out what I have to do to get the tis
package to pass R CMD check. I really don't want to force users of the tis
package to have to install ggplot2. What can I do? Is it enough to have
>
Imports: ggplot2
in the DESCRIPTION file and
import(ggplot2)
in the NAMESPACE file? I've done that, but I still get this warning from R
CMD check:
* checking for unstated dependencies in R code ... WARNING
'library' or 'require' calls not declared from:
ggplot2
See the information on DESCRIPTION files in the chapter 'Creating R
packages' of the 'Writing R Extensions' manual.
If you load another package explicitly, it is not sufficient to declare
it as imports (because you are not only importing from it), but you need
it in Depends, Suggests or Enhances, dependending on the tasks you are
going to perform. Since you do not want that the user needs to install
it, you want to write it into Suggests, I think.
Uwe Ligges
Well, I did read the manual, and it seems to say that what I'm doing is OK. So
why am I getting the warning?
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