Re: scatter-plotting by color

[John Day]

[Commenting on my own help request]: Perhaps I didn't make the data 
structure clear. I have a 3-column matrix that looks like this:
-0.016634,-0.001467,3
-0.005236,-0.003526,2
0.006136,0.003776,4
0.002952,-0.009264,2

I want to scatter-plot cols 1 and 2 such that the plotted points are 
distinguished by the values in col 3, which are integers in the range 
1..16. I know this is not hard to do, but I thought maybe someone had 
already written a nifty routine to do this, or perhaps I've overlooked an 
easy one-line solution here. Otherwise it seems I would have to write a 
function that maps integers into the plot() symbols for color and shape etc.

Thanks again,
John Day

At 07:24 PM 12/19/01 -0500, John Day wrote:
> 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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