Data Frame Column Slice

We retrieve a data frame column slice with the single square bracket "[]" operator.

Numeric Indexing

The following is a slice containing the first column of the built-in data set mtcars.

Name Indexing

We can retrieve the same column slice by its name.

To retrieve a data frame slice with the two columns mpg and hp, we pack the column names in an index vector inside the single square bracket operator.