The XR package defines classes and functions that will be extended and used by interfaces from R to other languages. The goals are: a uniform approach; simplicity in programming; users of application packages should be essentially unaware that particular functions and objects are in fact proxies for computations in other languages.
The functions in this package will nearly always be used by other packages, providing an interface to a particular language (see packages XRPython and XRJulia for examples). Users will rarely need to call functions in XR and application packages will rarely need to import it directly.
For further details, see the reference  (Chapter 13 is included in the documentation for this package).
 Chambers, John M. Extending R. Chapman & Hall, 2016
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.