getFromNamespace {utils}R Documentation

Utility functions for Developing Namespaces

Description

Utility functions to access and replace the non-exported functions in a namespace, for use in developing packages with namespaces.

Usage

getFromNamespace(x, ns, pos = -1, envir = as.environment(pos))
assignInNamespace(x, value, ns, pos = -1, envir = as.environment(pos))
fixInNamespace(x, ns, pos = -1, envir = as.environment(pos), ...)

Arguments

x an object name (given as a character string).
value an R object.
ns a namespace, or character string giving the namespace.
pos where to look for the object: see get.
envir an alternative way to specify an environment to look in.
... arguments to pass to the editor: see edit.

Details

The namespace can be specified in several ways. Using, for example, ns = "stats" is the most direct, but a loaded package with a namespace can be specified via any of the methods used for get: ns can also be the environment printed as <namespace:foo>.

getFromNamespace is similar to (but predates) the ::: operator, but is more flexible in how the namespace is specified.

fixInNamespace invokes edit on the object named x and assigns the revised object in place of the original object. For compatibility with fix, x can be unquoted.

Value

getFromNamespace returns the object found (or gives an error).
assignInNamespace and fixInNamespace are invoked for their side effect of changing the object in the namespace.

Note

assignInNamespace and fixInNamespace change the copy in the namespace, but not any copies already exported from the namespace, in particular an object of that name in the package (if already attached) and any copies already imported into other namespaces. They are really intended to be used only for objects which are not exported from the namespace. They do attempt to alter a copy registered as an S3 method if one is found.

See Also

get, fix, getS3method

Examples

getFromNamespace("findGeneric", "utils")
## Not run: 
fixInNamespace("predict.ppr", "stats")
stats:::predict.ppr
getS3method("predict", "ppr")
## alternatively
fixInNamespace("predict.ppr", pos = 3)
fixInNamespace("predict.ppr", pos = "package:stats")
## End(Not run)

[Package utils version 2.1.0 Index]