| Syntax {base} | R Documentation |
Operator Syntax and Precedence
Description
Outlines R syntax and gives the precedence of operators
Details
The following unary and binary operators are defined. They are listed in precedence groups, from highest to lowest.
[ [[ | indexing |
:: ::: | access variables in a name space |
$ @ | component / slot extraction |
^ | exponentiation (right to left) |
- + | unary minus and plus |
: | sequence operator |
%any% | special operators |
* / | multiply, divide |
+ - | (binary) add, subtract |
< > <= >= == != | ordering and comparison |
! | negation |
& && | and |
| || | or |
~ | as in formulae |
-> ->> | rightwards assignment |
= | assignment (right to left) |
<- <<- | assignment (right to left) |
? | help (unary and binary) |
Within an expression operators of equal precedence are evaluated from left to right except where indicated.
The links in the See Also section cover most other aspects of the basic syntax.
Note
There are substantial precedence differences between R and S. In
particular, in S ? has the same precedence as (binary) + -
and & && | || have equal precedence.
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
See Also
Arithmetic, Comparison, Control,
Extract, Logic,
NumericConstants, Paren,
Quotes, Reserved.
The R Language Definition manual.