Paren | R Documentation |
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.
( ... ) { ... }
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.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
if
, return
, etc for other objects used in
the R language itself.
Syntax
for operator precedence.
f <- get("(") e <- expression(3 + 2 * 4) identical(f(e), e) do <- get("{") do(x <- 3, y <- 2*x-3, 6-x-y); x; y ## note the differences (2+3) {2+3; 4+5} (invisible(2+3)) {invisible(2+3)}
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