| ns-load {base} | R Documentation |
Functions to load and unload namespaces.
attachNamespace(ns, pos = 2, dataPath = NULL)
loadNamespace(package, lib.loc = NULL,
keep.source = getOption("keep.source.pkgs"),
partial = FALSE, declarativeOnly = FALSE)
loadedNamespaces()
unloadNamespace(ns)
ns |
string or namespace object. |
pos |
integer specifying position to attach. |
dataPath |
path to directory containing a database of datasets to be lazy-loaded into the attached environment. |
package |
string naming the package/name space to load. |
lib.loc |
character vector specifying library search path. |
keep.source |
logical specifying whether to retain source.
This applies only to the specified name space, and not to other name spaces
which might be loaded to satisfy imports.
For more details see this argument to library.
|
partial |
logical; if true, stop just after loading code. |
declarativeOnly |
logical; disables .Import, etc, if true. |
The functions loadNamespace and attachNamespace are
usually called implicitly when library is used to load a name
space and any imports needed. However it may be useful to call
these functions directly at times.
loadNamespace loads the specified name space and registers it
in an internal data base. A request to load a name space when one of
that name is already loaded has no effect. The arguments have the
same meaning as the corresponding arguments to library,
whose help page explains the details of how a particular installed
package comes to be chosen. After loading, loadNamespace looks
for a hook function named .onLoad as an internal
variable in the name space (it should not be exported). This function
is called with the same arguments as .First.lib. Partial
loading is used to support installation with the --save and
--lazy options.
loadNamespace does not attach the name space it loads to the
search path. attachNamespace can be used to attach a frame
containing the exported values of a name space to the search path.
The hook function .onAttach is run after the name space
exports are attached.
loadedNamespaces returns a character vector of the names of
the loaded name spaces.
unloadNamespace can be used to attempt to force a name space to
be unloaded. If the namespace is attached, it is first
detached, thereby running a .Last.lib function
in the namespace if one is exported. Then an error is signaled if the
name space is imported by other loaded name spaces, and the namespace
is not unloaded. If defined, a hook function .onUnload
is run before removing the name space from the internal registry.
attachNamespace returns invisibly the environment it adds to
the search path.
loadNamespace returns the namespace environment, either one
already loaded or the one the function causes to be loaded.
loadedNamespaces returns a character vector.
unloadNamespace returns NULL, invisibly.
Luke Tierney