(R Tutorials for Citizen Data Scientist)
Beginners tutorial with R – Switch Statement
A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each case.
Syntax
The basic syntax for creating a switch statement in R is −
switch(expression, case1, case2, case3....)
The following rules apply to a switch statement −
- If the value of expression is not a character string it is coerced to integer.
- You can have any number of case statements within a switch. Each case is followed by the value to be compared to and a colon.
- If the value of the integer is between 1 and nargs()−1 (The max number of arguments)then the corresponding element of case condition is evaluated and the result returned.
- If expression evaluates to a character string then that string is matched (exactly) to the names of the elements.
- If there is more than one match, the first matching element is returned.
- No Default argument is available.
- In the case of no match, if there is a unnamed element of … its value is returned. (If there is more than one such argument an error is returned.)
Flow Diagram
Example
x <- switch( 3, "first", "second", "third", "fourth" ) print(x)
When the above code is compiled and executed, it produces the following result −
[1] "third"
Beginners tutorial with R – Switch Statement
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