R Programming: Create and Access elements of a List Containing a Vector, Matrix, and another List

Last update on December 21 2024 10:08:38 (UTC/GMT +8 hours)

Write a R program to create a list containing a vector, a matrix and a list and give names to the elements in the list. Access the first and second element of the list.

Sample Solution :

R Programming Code :

l# Create a list with 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)

# Assign names to each element of the list
names(list_data) = c("Color", "Odd numbers", "Language(s)")

# Print the list with the assigned names
print("List with column names:")
print(list_data)

# Access and print the first element of the list (the vector)
print('1st element:')
print(list_data[1])

# Access and print the second element of the list (the matrix)
print('2nd element:')
print(list_data[2])

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] "List with column names:"
$Color
[1] "Red"   "Green" "Black"

$`Odd numbers`
     [,1] [,2] [,3]
[1,]    1    5    9
[2,]    3    7   11

$`Language(s)`
$`Language(s)`[[1]]
[1] "Python"

$`Language(s)`[[2]]
[1] "PHP"

$`Language(s)`[[3]]
[1] "Java"


[1] "1st element:"
$Color
[1] "Red"   "Green" "Black"

[1] "2nd element:"
$`Odd numbers`
     [,1] [,2] [,3]
[1,]    1    5    9
[2,]    3    7   11                         

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"))
• A list list_data is created containing three elements:
• A character vector ("Red", "Green", "Black")
• A 2x3 matrix created from a sequence of odd numbers (1, 3, 5, 7, 9, 11)
• Another list containing programming languages ("Python", "PHP", "Java")
• Print the original list:
  print("List:")
  print(list_data)
• The entire list is printed, showing the contents of each element.
• Assign names to list elements:
  names(list_data) = c("Color", "Odd numbers", "Language(s)")
• Names are assigned to the three elements of the list:
• "Color" for the first element (vector)
• "Odd numbers" for the second element (matrix)
• "Language(s)" for the third element (list)
• Print the named list:
  print("List with column names:")
  print(list_data)
• The list is printed again, now with the assigned names visible for each element.
• Access and print the first element:
  print('1st element:')
  print(list_data[1])
• The first element of the list (the vector containing colors) is accessed and printed.
• Access and print the second element:
  print('2nd element:')
  print(list_data[2])
• The second element of the list (the matrix of odd numbers) is accessed and printed.

R Programming Code Editor:

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