[R] Labeling points on plot on relative warp scores?

[stephalope]

Hi there,

I am plotting relative warp scores (equivalent to pca scores) and I want to
label (color code and shape) the points by group. I can't figure out how to
do this beyond simple plotting. 

plot(RW1, RW2);

Do I need to make vectors of each group and then plot them separately onto
the same plot? How do I go about this?

Thanks!
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