scatter-plotting by color

[John Day]

I have a file of 3-tuples (X,Y,C), where C is an integer 1-16, which I want 
to scatter-plot, X by Y with C determining the color of the plotted dots.

Does anyone know or have a ready-made function to do this? I don't care 
what the colors are as long as they are unique for each value of C. 
Different-shaped dots will do if we run out of colors.

Thanks,
John Day



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