R Programming: Create a List and remove the second element

Last update on December 21 2024 10:11:29 (UTC/GMT +8 hours)

Write a R program to create a list containing a vector, a matrix and a list and remove the second element.

Sample Solution :

R Programming Code :

# Create a list containing a vector, a matrix, and another list
list_data <- list(c("Red","Green","Black"), matrix(c(1,3,5,7,9,11), nrow = 2),
list("Python", "PHP", "Java"))

# Print the original list
print("List:")
print(list_data)

# Print a message indicating that the second element will be removed
print("Remove the second element of the list:")

# Remove the second element from the list
list_data[2] = NULL

# Print the modified list
print("New list:")
print(list_data)

Output:

[1] "List:"
[[1]]
[1] "Red"   "Green" "Black"

[[2]]
     [,1] [,2] [,3]
[1,]    1    5    9
[2,]    3    7   11

[[3]]
[[3]][[1]]
[1] "Python"

[[3]][[2]]
[1] "PHP"

[[3]][[3]]
[1] "Java"


[1] "Remove the second element of the list:"
[1] "New list:"
[[1]]
[1] "Red"   "Green" "Black"

[[2]]
[[2]][[1]]
[1] "Python"

[[2]][[2]]
[1] "PHP"

[[2]][[3]]
[1] "Java"                         

Explanation:

• Create a List:
• list_data <- list(c("Red","Green","Black"), matrix(c(1,3,5,7,9,11), nrow = 2), list("Python", "PHP", "Java"))
• Creates a list named list_data containing:
• A vector with elements "Red", "Green", and "Black".
• A matrix with values 1, 3, 5, 7, 9, 11 arranged into 2 rows.
• A nested list containing "Python", "PHP", and "Java".
• Print Original List:
• print("List:")
• Prints the label "List:".
• print(list_data)
• Prints the contents of list_data, which shows the vector, matrix, and nested list.
• Print Message about Removal:
• print("Remove the second element of the list:")
• Prints the message indicating that the second element of the list will be removed.
• Remove Second Element:
• list_data[2] = NULL
• Removes the second element (the matrix) from the list by setting it to NULL.
• Print Modified List:
• print("New list:")
• Prints the label "New list:".
• print(list_data)
• Prints the modified list_data, which now contains only the vector and the nested list/

R Programming Code Editor:

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