As Duncan suggested, this will probably get you what you want. You can set the transparency using alpha.f in adjustcolor().
x <- c(1:5) color <- c(2,2,3,4,5) color_transparent <- adjustcolor(color, alpha.f = 0.3) plot(x, col = color, pch = 20, cex = 4) plot(x, col = color_transparent, pch = 20, cex = 4) ?adjustcolor Richard On Wed, Dec 18, 2013 at 2:35 PM, Christoph Scherber <csche...@gwdg.de>wrote: > 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.dun...@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]] >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/ >> posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/ > posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
