R is an open-source programming language that is widely used as a statistical software and data analysis tool. R generally comes with the Command-line interface. R is available across widely used platforms like Windows, Linux, and macOS. Also, the R programming language is the latest cutting-edge tool. This article specifies how to remove one or more elements from a given list in R language. It will specify the number of elements to be removed from the list and print the rest elements. As a result, it will return a list of data after performing the operation. You will learn how to remove certain elements from the list.
Method 1: Removing Item from the list using (-) method
Syntax: To remove elements using minus sign
my_list[- number]
Parameters:
number – Specifies the number of elements to be removed from the list
Return:
Return list after removing elements
Approach
- Create a vector.
- Remove one specific element using the (-) method.
- Delete multiple elements using the same method as illustrated in examples.
Example:
# Create example list my_list <- list(a = c(1, 4, 2, 7),
b = "geeksforgeeks",
c = 2)
my_list # remove elements my_list[- 1] |
Output:
Here, in the above example, my_list[- 1] will remove the data stored in the first list, and after removal of the first data list print the rest data on the screen.
Method 2: Remove elements using NULL assignment
Syntax:
my_list_2[number] <- NULL
Example:
my_list <- list(a = c(1, 4, 2, 7), # Create example list
b = "geeksforgeeks",
c = 2)
my_list my_list_2 <- my_list # Replicate list
my_list_2[1] <- NULL # Remove list elements with NULL
my_list_2 |
Output :
The above example will remove elements by making them NULL in the list by using the my_list_2[] <- NULL method. It will clear specific data and print the rest data on the screen.
Method 3: Remove elements using the %in% operator
Syntax:
my_list[names(my_list) %in% "number" == FALSE]
Example:
# Create example list my_list <- list(a = c(1, 4, 2, 7),
b = "geeksforgeeks",
c = 2)
my_list # Remove elements my_list[names(my_list) %in% "c" == FALSE]
|
Output:
my_list[names(my_list) %in% “c” == FALSE], with this method the list of data which are declared as false, which get removed from the data list and other will be printed on the screen.
Method 4: Remove element using != operator
Syntax:
my_list[names(my_list) != "number"]
Example:
# Create example list my_list <- list(a = c(1, 4, 2, 7),
b = "geeksforgeeks",
c = 2)
my_list my_list[names(my_list) != "a"]
|
Output:
my_list[names(my_list) != ” ” In above code the data list number which is entered between double quote will get removed .
Below is the implementation to remove multiple data at a time
Example:
# Create example list my_list <- list(a = c(1, 4, 2, 7),
b = "geeksforgeeks",
c = 2)
my_list my_list[- c(1, 3)]
|
Output: