On 1/24/2011 7:44 AM, Sam wrote:
Dear List,
I am having trouble setting the transparency of a ribbon in ggplot2
and was wondering if anybody had any suggestions
so far i have a plot exactly as i want it and i want to add a ribbon
connecting the ymax and ymin, whci i do with the following command
m10 + stat_summary(geom="ribbon", fun.ymin="min", fun.ymax="max")
However the ribbon is a dark grey and i want to make it much lighter
or change the colour. I was wondering if anybody had any ideas?
I have kept the code used so far brief as it is quite long, however i
can expand if required.
To see what is happening, a simple toy example works; the details of
your specific graph aren't needed.
p <- ggplot(mtcars, aes(x=carb, y=mpg)) + geom_point()
p + stat_summary(geom="ribbon", fun.ymin="min", fun.ymax="max")
p + stat_summary(geom="ribbon", fun.ymin="min", fun.ymax="max",
alpha=0.2, fill="blue")
You can set the transparency (alpha) of the fill and the color of the
fill (fill) to whatever you want. You can also set the color of the
lines around the fill with colour. As fixed (not data determined)
values, they are not inside an aes call.
Thanks
Sam
--
Brian S. Diggs, PhD
Senior Research Associate, Department of Surgery
Oregon Health & Science University
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