The replacement operator. Replaces the lhs with rhs on the
condition that length(lhs) == FALSE (the length is 0).
| 1 | lhs %R% rhs
 | 
| lhs | An object of any length. | 
| rhs | A replacement value if   | 
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.