R語言學習筆記：查看函數的R源代碼

getAnywhere

該函數能夠返回一些函數的R源代碼，如：

• 　　getAnywhere(kmeans)

 

該函數具體用法，請參看官方說明。

Retrieve an R Object, Including from a Namespace

Description

These functions locate all objects with name matching their argument, whether visible on the search path, registered as an S3 method or in a namespace but not exported. getAnywhere() returns the objects and argsAnywhere() returns the arguments of any objects that are functions.

Usage

getAnywhere(x)
argsAnywhere(x)

Arguments

x	a character string or name.

Details

These functions look at all loaded namespaces, whether or not they are associated with a package on the search list.

They do not search literally 「anywhere」: for example, local evaluation frames and namespaces that are not loaded will not be searched.

Where functions are found as registered S3 methods, an attempt is made to find which namespace registered them. This may not be correct, especially if namespaces have been unloaded.

Value

For getAnywhere() an object of class "getAnywhere". This is a list with components

name	the name searched for
objs	a list of objects found
where	a character vector explaining where the object(s) were found
visible	logical: is the object visible
dups	logical: is the object identical to one earlier in the list.

In computing whether objects are identical, their environments are ignored.

Normally the structure will be hidden by the print method. There is a [ method to extract one or more of the objects found.

For argsAnywhere() one or more argument lists as returned by args.

See Also

getS3method to find the method which would be used: this might not be the one of those returned by getAnywhere since it might have come from a namespace which was unloaded or be registered under another name.

get, getFromNamespace, args

Examples

getAnywhere("format.dist")
getAnywhere("simpleLoess") # not exported from stats
argsAnywhere(format.dist)