R包 - 我应该导入`methods`包吗？

Question

I'm using setRefClass to create classes and since is part of the methods package, I presumed you need to declare this dependency as an import .

However, the following minimal example fails Rcmd.exe check when import ing methods :

#' @docType package
#' @import methods
A <- setRefClass("A")

with the following error (my package is called Test ):

==> Rcmd.exe check Test_1.0.tar.gz

<Lots of checks here...>

* checking package dependencies ... ERROR
Namespace dependency not required: 'methods'

See the information on DESCRIPTION files in the chapter 'Creating R
packages' of the 'Writing R Extensions' manual.

Exited with status 1.

So from what I can make out, it appears I'm being told to remove the import for methods and so keep hidden the package's dependency on methods . Is my interpretation correct and if so, why hide the dependency on methods ?

My setup:

• Roxygen2 3.0.0
• R: 3.0.2 (Frisbee Sailing)
• IDE: RStudio 0.98.490
• OS: Windows 8.1

Answer 1

经过更多的狩猎，我意识到，在我的匆忙中，我忘了在我的DESCRIPTION文件中添加Imports: methods 。