[R] color ranges on a 2D plot

[dxc13]

useR's

I am trying to color the points on a scatter plot (code below) with two
colors.  Red for values 0.5 -1.0 and blue for 0.0 - .49.  Does anyone know a
easy way to do this?

x <- runif(100, 0, 1)
y <- runif(100, 0, 1)
plot(y ~ x, pch=16)

Thanks,
dxc13
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