In this tutorial you will learn about the R ifelse() Function and its application with practical example.
R ifelse() Function
In R, the ifelse function is a vectorized version of standard R if..else statement. The ifelse function returns a value in the same shape as of the test expression. This vectorization makes it much faster than applying the same function to each of the vector element individually.
Syntax:-
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ifelse(expression, x, y) |
expression :- Boolean Vector
x :- Return values for true elements of expression
y :- Return values for false elements of expression
Here, expression is a boolean vector (or coerced to boolean) and return value x and y is also vector with the same length as expression. The element i is x[i] if expression[i] is true, or y[i] if expression[i] is false.
Example:-
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print("W3Adda - R ifelse function") num <- 1:10 res <- ifelse(num %% 2 == 0, "Even","Odd") # %% is the mod operator res |
Output:-
r_ifelse_function
