Hi:

Here's a ggplot2 example:

p <- ggplot(mtcars, aes(x = wt, y = mpg))
p + geom_rect(xmin = 2, xmax = 3, ymin = 0, ymax = Inf, fill = 'green',
     alpha = 0.2) + geom_point() + theme_bw()

I don't know why the alpha transparency doesn't work in this example, but
plotting the points after shading the rectangle at least makes the points
visible.

HTH,
Dennis


On Mon, Sep 13, 2010 at 6:58 AM, threshold <r.kozarski@gmail.com> wrote:

>
> Thanks for replying, indeed works.
> I forgot to mention that I am looking for a 'transparent shading' s.t. the
> plot symbols are still visible on the shaded area.
> robert
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