[R] Plot colors

[uv]

Hi. I am plotting graphs for values ranging between -1 and 10, for example:
(1,2,1,1,6,7,-1,-1,5,-1)
I am trying to plot the graphs so that the points with value of -1 will be
in one specific color, and the rest of the points will be in one different
specific color. I would be grateful for any idea of how to do that in two
colors.
Thanks for any hint.
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