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
( ... )
{ ... }
Arguments
Value
For (, the result of evaluating the argument. This has
visibility set, so will auto-print if used at top-level.For {, the result of the last expression evaluated. This has
the visibility of the last evaluation.
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
The New S Language.
Wadsworth & Brooks/Cole.
See Also
if, return, etc for other objects used in
the R language itself.