data.table Adding and modifying columns Renaming columns
Example
# example data
DT = as.data.table(mtcars, keep.rownames = TRUE)
To rename a column (while keeping its data the same), there is no need to copy the data to a column with a new name and delete the old one. Instead, we can use
setnames(DT, "mpg_sq", "mpq_squared")
to modify the original column by reference.
