The zoo package has lattice methods and does not use require and it puts lattice in Imports in the DESCRIPTION file. If a user wants to the use the zoo lattice functions then they must issue a library(lattice) call. As a result users do not have to load lattice but if they want to use it they must do it themselves.
library(zoo) z <- zoo(1:4) xyplot(z) # wrong library(lattice) xyplot(z) # yes! On Tue, Jun 2, 2009 at 5:14 PM, Jeffrey J. Hallman <[email protected]> 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. > > 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? > > -- > Jeff > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
