Which graphics device are you using?

________________________________

From: r-help-bounces@stat.math.ethz.ch on behalf of Jun Ding
Sent: Wed 3/7/2007 9:47 PM
To: r-help@stat.math.ethz.ch
Subject: [R] alpha parameter in function rgb to specify color



Hi All,

In function "rgb", alpha parameter is supposed to set
the transparency value. But in my following two
examples, it didn't work:

plot(1,col = rgb(1,0,0,alpha =0.8))
# as long as alpha < 1, there is no point in the plot.

plot(1,col = rgb(0,0,255, alpha=254,
maxColorValue=255))
# as long as alpha < 255, there is no point in the
plot.

Do I use it in the right way? Any advice is
appreciated.

Best,

Jun Ding



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