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The R function used to exchange/swap column names is names() function.

To swap the column names, you can simply assign the new order of names to the names() function. Here's an example:

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

# swap the column names
names(df) <- c("C", "A", "B")

# print the updated data frame
df

Output:

  C A B
1 7 1 4
2 8 2 5
3 9 3 6