R Program to assign NULL to a given list element

How to assign NULL to a given list element

Here we are explaining how to write an R program to assign NULL to a given list element. Here we are using a NULL object for the assignment. it is a reserved word and it is often returned by the expressions or functions whose value is undefined. The syntax of NULL using conditions

NULL
as.null(x, …)
is.null(x) 

Where x is an object to be tested, and dots(...) are to be ignored.

How to assign NULL to a given list element in the R program

Below are the steps used in the R program to assign NULL value to a given list element. In this R program, we directly give the value NULL to the element. First, assign a list to the variable lis. And assign value NULL by specifying the position of value in the list.

ALGORITHM

STEP 1: Assign variables lis with a list

STEP 2: Print the original lists

STEP 3:Assign NULL value to 2nd and 3rd element by giving lis[2] = list(NULL) , lis[3] = list(NULL) 

STEP 4: Print the final list

R Source Code

                                          lis = list(10, 20, 30, 40, 50)
print("Original list is:")
print(l)
print("Set 2nd and 3rd elements changes to NULL")
lis[2] = list(NULL) 
lis[3] = list(NULL) 
print(lis)
                                      

OUTPUT

[1] "Original list is:"
[[1]]
[1] 10

[[2]]
[1] 20

[[3]]
[1] 30

[[4]]
[1] 40

[[5]]
[1] 50

[1] "Set 2nd and 3rd elements changes to NULL"
[[1]]
[1] 10

[[2]]
NULL

[[3]]
NULL

[[4]]
[1] 40

[[5]]
[1] 50