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Exercise

Formula notation

As well as the vars() notation for specifying which variables should be used to split the dataset into facets, there is also a traditional formula notation. The three cases are shown in the table.

Modern notation Formula notation
facet_grid(rows = vars(A)) facet_grid(A ~ .)
facet_grid(cols = vars(B)) facet_grid(. ~ B)
facet_grid(rows = vars(A), cols = vars(B)) facet_grid(A ~ B)

mpg_by_wt is available again. Rework the previous plots, this time using formula notation.

Instructions 1/3
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  • 1
    • Facet the plot in a grid, with each am value in its own row.
    • 2
      • Facet the plot in a grid, with each cyl value in its own column.
    • 3
      • Facet the plot in a grid, with each am value in its own row and each cyl value in its own column.