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plot() function: color transparency
6 messages · capricy gao, Duncan Murdoch, Christoph Scherber +1 more
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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you will need to specify colours as RGB values and then set transparency via the "alpha" argument. e.g.: color=rgb(0,0,0,alpha=0.3) # will give black (0,0,0) and a transparency of 30%. Best wishes Christoph
On 18/12/2013 23:23, capricy gao wrote:
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 at 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 [[alternative HTML version deleted]]
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On 13-12-18 5:23 PM, capricy gao wrote:
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"....
You didn't read very carefully. Duncan Murdoch
On Wednesday, December 18, 2013 1:18 PM, Duncan Murdoch <murdoch.duncan at 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