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> new_df$Z # Output the Z column[1] 12 42

> new_df$Z == new_df['Z'] && new_df[3] == new_df$Z # The dataframe column Z can be accessed using the syntax $Z, ['Z'], or [3], and the values are the same. [1] TRUE

> attributes(new_df) # Print information about attributes of the new_df dataframe$names[1] "X" "Y" "Z"

$row.names[1] "A" "B"

$class[1] "data.frame"

> attributes(new_df)$row.names <- c("one", "two") # Access and then change the row.names attribute; this can also be done using the rownames() function> new_df X Y Zone 2 6 12two 20 30 42

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