[R] alpha parameter in function rgb to specify color

[Jun Ding]

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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