Paren                  package:base                  R Documentation

Parentheses and Braces

Description:

     Open parenthesis, `(', and open brace, `{', are `.Primitive'
     functions in R.

     Effectively, `(' is semantically equivalent to the identity
     `function(x) x', whereas `{' is slightly more interesting, see
     examples.

Usage:

     ( ... )

     { ... }

See Also:

     `if', `return', etc for other objects used in the R language
     itself.

Examples:

     f <- get("(")
     e <- expression(3 + 2 * 4)
     f(e) == e           # TRUE

     do <- get("{")
     do(x <- 3, y <- 2*x-3, 6-x-y); x; y

