Operator Precedence | R Operator Precedence and Associativity - r - learn r - r programming
- When multiple operators are used in a single expression, we need to know the precedence of these operators to figure out the sequence of operation that will take place.
- Precedence defines the order of execution, i.e., which operator gets the higher priority.
Example 1: Operator Precedence in R
- Here, the * operator gets higher priority than + and hence 3 + 7 * 6 is interpreted as 3 + (7 * 6).
- This order can be changed with the use of parentheses ().
- It is possible to have multiple operators of same precedence in an expression. In such case the order of execution is determined through associativity.
- The associativity of operators is given in the table above.
- We can see that most of them have left to right associativity.
Example 2: Operator Associativity in R
- In the above example, 5 / 6 / 7is evaluated as (5 / 6) / 7 due to left to right associativity of the / operator. However, this order too can be changed using parentheses ().
Precedence and Associativity of different operators in R from highest to lowest
|^||Exponent||Right to Left|
|-x, +x||Unary minus, Unary plus||Left to Right|
|%%||Modulus||Left to Right|
|*, /||Multiplication, Division||Left to Right|
|+, -||Addition, Subtraction||Left to Right|
|<, >, <=, >=, ==, !=||Comparisions||Left to Right|
|!||Logical NOT||Left to Right|
|&, &&||Logical AND||Left to Right|
||, ||||Logical OR||Left to Right|
|->, ->>||Rightward assignment||Left to Right|
|<-, <<-||Leftward assignment||Right to Left|
|=||Leftward assignment||Right to Left|