scale_shape_manual
ARGUMENTS
no arguments
without the scale
breaks
guide
labels
name
na.translate
drop
na.value
values
Actually, you have to add the values argument to every manual scale.
mpg$cyl <- as.factor(mpg$cyl)
ggplot(mpg, aes(x = displ, y = hwy, shape = hwy)) +
geom_point(size = 3) +
scale_shape_manual(values = c(8, 6, 1, 2))
ggplot2tor
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