R Programming: Convert two Columns of a DataFrame to a named Vector

Last update on December 21 2024 10:08:59 (UTC/GMT +8 hours)

Write a R program to convert two columns of a data frame to a named vector.

Sample Solution :

R Programming Code :

# Create a data frame 'df' with two columns: 'code' and 'name'
df = data.frame(code = c("R", "G", "W", "B"), 
               name = c("Red", "Green", "White", "Black"))

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

# Print the contents of the data frame 'df'
print(df)

# Convert the 'name' column to a character vector and set the 'code' column as names for the vector
result = setNames(as.character(df$name), df$code)

# Print the named vector 'result'
print(result)

Output:

[1] "Original vector:"
  code  name
1    R   Red
2    G Green
3    W White
4    B Black
      R       G       W       B 
  "Red" "Green" "White" "Black"                         

Explanation:

• Create a data frame:
• df = data.frame(code = c("R", "G", "W", "B"), name = c("Red", "Green", "White", "Black"))
  A data frame df is created with two columns: code (containing "R", "G", "W", "B") and name (containing "Red", "Green", "White", "Black").
• Print the original data frame:
• print("Original vector:")
  Prints a message indicating that the following output will display the original data frame.
• Display the data frame:
• print(df)
  Displays the content of the data frame df.
• Convert columns to a named vector:
• result = setNames(as.character(df$name), df$code)
  Converts the name column to a character vector and uses the code column as names for this vector. The result is a named vector where each name corresponds to an element from the name column.
• Print the named vector:
• print(result)
  Displays the named vector result with code values as names and name values as the corresponding elements.

R Programming Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a R program to count number of values in a range in a given vector.
Next: Wrtie a R program to create a vector and find the length and the dimension of the vector.