I have a scatterplot where the points belong to 15 classes. I try to use color to distinguish the points classes:
ggplot(df, aes(V3, V4, color=V1)) + geom_point()
The problem is that it is difficult to distinguish 15 colors. I could use shape instead of colors but there are two few shapes.
I understand how I can use shape and color to distinguish two different class aspects of a geo, but here I only want to distinguish one class, but the thing is the class number is high, so I want to combine shape and color to make points class belonging easier to distinguish.
So what I ideally want is to use the six shapes and cycle through the colors. Is there an easy way to do that with ggplot?