R Nested Functions
Nested Functions
There are two ways to create a nested function:
- Call a function within another function.
- Write a function within a function.
Example
Call a function within another function:
Nested_function <- function(x, y) {
a <- x + y
return(a)
}
Nested_function(Nested_function(2,2), Nested_function(3,3))
Try it Yourself »
Example Explained
The function tells x to add y.
The first input Nested_function(2,2) is "x" of the main function.
The second input Nested_function(3,3) is "y" of the main function.
The output is therefore (2+2) + (3+3) = 10.
Example
Write a function within a function:
Outer_func <- function(x) {
Inner_func <- function(y) {
a <- x + y
return(a)
}
return
(Inner_func)
}
output <- Outer_func(3) # To
call the Outer_func
output(5)
Try it Yourself »
Example Explained
You cannot directly call the function because the Inner_func has been defined (nested) inside the Outer_func.
We need to call Outer_func first in order to call Inner_func as a second step.
We need to create a new variable called output and give it a value, which is 3 here.
We then print the output with the desired value of "y", which in this case is 5.
The output is therefore 8 (3 + 5).
