Legends - R Graphics - page 290

Solution
Use guides() , and specify the scale that should have its legend removed ( Figure 10-1 ):

# The base plot (with legend)
p <- ggplot(PlantGrowth, aes(x = group, y = weight, fill = group)) + geom_boxplot()
p

# Remove the legend for fill
p + guides(fill = FALSE

FALSE )

Figure 10-1. Left: default appearance; right: with legend removed

Discussion
Another way to remove a legend is to set guide=FALSE in the scale. This will result in the exact
same output as the preceding code:

# Remove the legend for fill
p + scale_fill_discrete(guide = FALSE

FALSE )

Yet another way to remove the legend is to use the theming system. If you have more than one
aesthetic mapping with a legend ( color and shape , for example), this will remove legends for
all of them:

p + theme(legend.position = "none" )