Scatter Plots - R Graphics - page 100

This will set different shapes and colors for the grouping variables ( Figure 5-5 , right):
ggplot(heightweight, aes(x = ageYear, y = heightIn, shape = sex, colour = sex)) +
geom_point() +
scale_shape_manual(values = c( 1 , 2 )) +
scale_colour_brewer(palette = "Set1" )
Figure 5-5. Left: mapping to both shape and colour; right: with manually set shapes and colors
See Also
To use different shapes, see Using Diferent Point Shapes .
For more on using different colors, see Chapter 12 .
Using Different Point Shapes
Problem
You want to use point shapes that are different from the defaults.
Solution
If you want to set the shape of all the points ( Figure 5-6 ), specify the shape in geom_point() :
library(gcookbook) # For the data set
ggplot(heightweight, aes(x = ageYear, y = heightIn)) + geom_point(shape = 3 )