I checked as you suggested. However, I found that the number in those functions are the number of colors. In contrast, my number here means a specific color, for example, 2 in my code means "red", 3 in my code means "green"....





On Wednesday, December 18, 2013 1:18 PM, Duncan Murdoch <murdoch.duncan@gmail.com> wrote:
 
On 13-12-18 2:08 PM, capricy gao wrote:

> I found all the color transparency was defined with character color, or rgb color. What if I have number code and still try to modify the transparency?
>
> For example:
>
>> x=c(1:5)
>> color=c(2,2,3,4,5)
>> plot(x, col=color)
>> plot(x, col=color,pch=20)
>
> here I defined color by numbers, how can I modify the transparency?

See the examples for ?palette.

Duncan Murdoch
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