R Programming - Reorder Columns in Data Frame by Column name

Last update on June 04 2025 12:53:20 (UTC/GMT +8 hours)

Write a R program to reorder an given data frame by column name.

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'),
  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 a message indicating the original data frame
print("Original dataframe:")

# Print the contents of 'exam_data'
print(exam_data)

# Print a message indicating that columns will be reordered
print("Reorder by column name:")

# Reorder columns of 'exam_data' to the specified order
exam_data = exam_data[c("name", "attempts", "score", "qualify")]

# Print the reordered data frame
print(exam_data)

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] "Reorder by column name:"
        name attempts score qualify
1  Anastasia        1  12.5     yes
2       Dima        3   9.0      no
3  Katherine        2  16.5     yes
4      James        3  12.0      no
5      Emily        2   9.0      no
6    Michael        3  20.0     yes
7    Matthew        1  14.5     yes
8      Laura        1  13.5      no
9      Kevin        2   8.0      no
10     Jonas        1  19.0     yes

Explanation:

Create Data Frame:

exam_data = data.frame(...)
Creates a data frame named exam_data with four columns: name, score, attempts, and qualify.
Each column is populated with a vector of values, representing student names, scores, number of attempts, and qualification status respectively.

Print Original Data Frame:

print("Original dataframe:")
Prints a message indicating that the original data frame will be displayed.
print(exam_data)
Displays the contents of exam_data before any modifications.

Print Reordering Message:

print("Reorder by column name:")
Prints a message indicating that the columns of the data frame will be reordered.

Reorder Columns:

exam_data = exam_data[c("name", "attempts", "score", "qualify")]
Reorders the columns of exam_data according to the specified order: name, attempts, score, qualify.

Print Reordered Data Frame:

print(exam_data)
Displays the contents of the data frame after the columns have been reordered.

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R Programming Code Editor:

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