DOUBLE HOOK RETRACTOR

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Based on the provided search results, here is a comprehensive description of "double hook R with a focus on various contexts:

In R, a double hook refers to the use of the double colon operator () to access objects in a package when the package is not on the search path. This operator is used to qualify names, ensuring that R looks for the object in the specified package namespace rather than the global environment. For example, packageobject instead of just object.

Additionally, in R, hooks are functions that can be set to modify the behavior of certain events, such as package loading or attachment. The setHook function is used to establish these hooks, and they can be removed using setHook(hookName, NULL, "replace"). Hooks can be defined in various places, including the .Rprofile file, but the order of initialization events depends on the hooks defined and whether a package is attached or just loaded.