Modify values of a Data Frame in R Language – transform …

In R, the transform() function allows you to modify the values of columns in a data frame. You can use it to add new columns, update existing ones, or perform operations on the columns. Here’s a basic structure of how to use the transform() function:

# Sample data frame
df <- data.frame(
  A = c(1, 2, 3),
  B = c(4, 5, 6),
  C = c(7, 8, 9)
)

# Applying transform to modify columns
df_transformed <- transform(df,
                            A = A + 10,   # Modify column A
                            B = B * 2,    # Modify column B
                            C = C - 3     # Modify column C
)

# View the modified data frame
print(df_transformed)

In this example:

• Column A is increased by 10.
• Column B is multiplied by 2.
• Column C is decreased by 3.

Additional Notes:

• The transform() function creates a copy of the data frame with the modified values and does not alter the original data frame unless you assign the result back to it (like df <- transform(...)).
• You can also add new columns during the transformation by simply providing a name for the new column.

Let me know if you need help with any specific transformations!