[R] an operator for "contains"

[Thomas Lumley]

On Fri, 17 Jun 2005, Mike R wrote:

> k = c(1:9)
> if( length( which(k==3) ) ){ print("contained") }else{ print("not contained") }
>
> is therre a simple way to test if a vector/list contains a particular value?

  value %in% vector

> more generally, is the a documentaion page that lists/describes all
> such operators?

No.  You can find binary operators fairly effectively by looking at the 
html help, because they have to have non-alphabetic names (either single 
characters or beginning and ending with %).

However, there are functions such as setdiff() that you might think of as 
binary operators that you wouldn't find this way.

 	-thomas