Graphics Reference
In-Depth Information
Figure 5-7. Shapes in R
It's possible to have the shape represent one variable and the fill (empty or solid) represent anoth-
er variable. This is done a little indirectly, by choosing shapes that have both
colour
and
fill
,
and a color palette that includes
NA
and another color (the
NA
will result in a hollow shape). For
example, we'll take the
heightweight
data set and add another column that indicates whether
the child weighed 100 pounds or more (
Figure 5-8
):
