R Programming: Save and Display Data Frame information in file

R Programming: Data frame Exercise-22 with Solution

Write a R program to save the information of a data frame in a file and display the information of the file.

Sample Solution:

R Programming Code:

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

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

# Display the original 'exam_data' data frame
print(exam_data)

# Save the 'exam_data' data frame to a file named 'data.rda'
save(exam_data, file = "data.rda")

# Load the data from the file 'data.rda' into the current R session
load("data.rda")

# Get information about the file 'data.rda' (such as size, type, and permissions)
file.info("data.rda")

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
         size isdir mode               mtime               ctime
data.rda  344 FALSE  644 2018-10-25 12:06:09 2018-10-25 12:06:09
                       atime  uid  gid   uname  grname
data.rda 2018-10-25 12:06:09 1000 1000 trinket trinket

Explanation:

• Create a data frame:
• A data frame named exam_data is created with four columns: name, score, attempts, and qualify.
• Each column contains a set of values:
• name: Names of the students.
• score: Corresponding scores for each student.
• attempts: Number of attempts made by each student.
• qualify: Indicates whether the student qualified (yes or no).
• Print a message:
• "Original dataframe:" is printed to indicate the data frame's content is displayed next.
• Display the data frame:
• The exam_data data frame is printed to show its contents.
• Save the data frame to a file:
• The exam_data data frame is saved to a file named data.rda using the save() function.
• Load the data from the file:
• The data saved in the file data.rda is loaded back into the R environment using the load() function.
• Display file information:
• The file.info() function displays information about the file data.rda, such as its size, permissions, and last modification time.

R Programming Code Editor:

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