R Programming - Extract 3^rd and 5^th Rows with 1^st and 3^rd Columns from a Data Frame

R Programming: Data frame Exercise-7 with Solution

Write a R program to extract 3^rd and 5^th rows with 1^st and 3^rd columns from a given data frame.

Sample Solution :

R Programming Code :

# Create a data frame named exam_data with four columns: name, score, attempts, and qualify
exam_data = data.frame(
  name = c('Anastasia', 'Dima', 'Katherine', 'James', 'Emily', 'Michael', 'Matthew', 'Laura', 'Kevin', 'Jonas'),
  score = c(12.5, 9, 16.5, 12, 9, 20, 14.5, 13.5, 8, 19),
  attempts = c(1, 3, 2, 3, 2, 3, 1, 1, 2, 1),
  qualify = c('yes', 'no', 'yes', 'no', 'no', 'yes', 'yes', 'no', 'no', 'yes')
)

# Print the message "Original dataframe:"
print("Original dataframe:")

# Print the content of the exam_data data frame
print(exam_data)

# Print the message "Extract 3rd and 5th rows with 1st and 3rd columns:"
print("Extract 3rd and 5th rows with 1st and 3rd columns :")

# Extract and print the 3rd and 5th rows and the 1st and 3rd columns of the data frame
result =  exam_data[c(3,5),c(1,3)]
print(result)

Output:

[1] "Original dataframe:"
        name score attempts qualify
1  Anastasia  12.5        1     yes
2       Dima   9.0        3      no
3  Katherine  16.5        2     yes
4      James  12.0        3      no
5      Emily   9.0        2      no
6    Michael  20.0        3     yes
7    Matthew  14.5        1     yes
8      Laura  13.5        1      no
9      Kevin   8.0        2      no
10     Jonas  19.0        1     yes
[1] "Extract 3rd and 5th rows with 1st and 3rd columns :"
       name attempts
3 Katherine        2
5     Emily        2                         

Explanation:

• Create Data Frame:
• exam_data = data.frame(...): Creates a data frame named exam_data with four columns: name, score, attempts, and qualify.
• name: A vector of student names.
• score: A vector of scores corresponding to the students.
• attempts: A vector of the number of attempts each student made.
• qualify: A vector indicating whether each student qualified or not.
• Print Original Data Frame:
• print("Original dataframe:"): Prints a message to indicate that the following output is the original data frame.
• print(exam_data): Displays the exam_data data frame.
• Extract Specific Rows and Columns:
• print("Extract 3rd and 5th rows with 1st and 3rd columns :"): Prints a message indicating that the following output will show the extraction of specific rows and columns.
• result = exam_data[c(3,5),c(1,3)]: Extracts the 3rd and 5th rows and the 1st and 3rd columns from the exam_data data frame and assigns it to the result variable.
• c(3,5): Specifies the 3rd and 5th rows.
• c(1,3): Specifies the 1st and 3rd columns.
• Print Extracted Data:
• print(result): Displays the extracted subset of the data frame, showing the 3rd and 5th rows with only the 1st and 3rd columns.

R Programming Code Editor:

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