R Programming: Extract first two Rows from a Data Frame

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

Write a R program to extract first two rows from a given data frame.

Sample Solution :

R Programming Code :

# Create a data frame named 'exam_data' with columns 'name', 'score', 'attempts', and 'qualify'
exam_data = data.frame(
  # Define the 'name' column with a vector of student names
  name = c('Anastasia', 'Dima', 'Katherine', 'James', 'Emily', 'Michael', 'Matthew', 'Laura', 'Kevin', 'Jonas'),
  # Define the 'score' column with a vector of scores corresponding to the names
  score = c(12.5, 9, 16.5, 12, 9, 20, 14.5, 13.5, 8, 19),
  # Define the 'attempts' column with a vector of the number of attempts each student made
  attempts = c(1, 3, 2, 3, 2, 3, 1, 1, 2, 1),
  # Define the 'qualify' column with a vector indicating whether each student qualified
  qualify = c('yes', 'no', 'yes', 'no', 'no', 'yes', 'yes', 'no', 'no', 'yes')
)

# Print a message indicating that the following output is the original data frame
print("Original dataframe:")

# Print the 'exam_data' data frame to display its contents
print(exam_data)

# Print a message indicating that the following output will show the first two rows
print("Extract first two rows:")

# Extract the first two rows of the 'exam_data' data frame and store them in a new data frame named 'result'
result = exam_data[1:2,]

# Print the 'result' data frame to display the extracted rows
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 first two rows:"
       name score attempts qualify
1 Anastasia  12.5        1     yes
2      Dima   9.0        3      no                         

Explanation:

• Creates a data frame named exam_data with four columns: name, score, attempts, and qualify. Each column contains a vector of values corresponding to students' names, their scores, the number of attempts, and whether they qualified, respectively.
• Prints the message "Original dataframe:" to indicate the following output. Then prints the exam_data data frame to display its content.
• Extracts the first two rows of the exam_data data frame and stores them in a new data frame named result. Prints the message "Extract first two rows:" followed by the result data frame to show only the first two rows of the original data frame.

R Programming Code Editor:

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