Hello, I am having difficulty obtaining the correct colors in my R charts.> colors()[c(552, 254, 26)][1] "red" "green" "blue" But, if I specify col=552 in my barplot, I get gray bars. Likewise, col=254 gives bright pink, and col=26 is a red-orange. I get accurate results when I spell out the names, but I am making a pallet with 20- 30 colors and it is a real pain to have to do that. Can anyone help me figure out what I am doing wrong? Thanks [[alternative HTML version deleted]]
Those numbers that you pass to col = ... correspond to the current sessions palette, not to the names of colors() that R knows about. You can either set up your own palette: ## see current palette palette() [1] "black" "red" "green3" "blue" "cyan" "magenta" "yellow" [8] "gray" ## set up new palette palette(grey(seq(0, 0.9, length = 25))) plot(1:25, col = 1:25, pch = 16) or give a direct set of colours to col = as either character names or hex values. See "Color Specification" under ?par and ?palette for an overview and pointers to other functions. Cheers, MIke. On Tue, Dec 10, 2013 at 9:08 AM, Katharine Miller - NOAA Federal <katharine.miller at noaa.gov> wrote:> Hello, > > I am having difficulty obtaining the correct colors in my R charts. > >> colors()[c(552, 254, 26)] > [1] "red" "green" "blue" > > But, if I specify col=552 in my barplot, I get gray bars. Likewise, > col=254 gives bright pink, and col=26 is a red-orange. I get accurate > results when I spell out the names, but I am making a pallet with 20- 30 > colors and it is a real pain to have to do that. Can anyone help me figure > out what I am doing wrong? > > Thanks > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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.-- Michael Sumner Hobart, Australia e-mail: mdsumner at gmail.com
On Mon, Dec 9, 2013 at 2:08 PM, Katharine Miller - NOAA Federal <katharine.miller at noaa.gov> wrote:> Hello, > > I am having difficulty obtaining the correct colors in my R charts. > >> colors()[c(552, 254, 26)] > [1] "red" "green" "blue" > > But, if I specify col=552 in my barplot, I get gray bars. Likewise, > col=254 gives bright pink, and col=26 is a red-orange. I get accurate > results when I spell out the names, but I am making a pallet with 20- 30 > colors and it is a real pain to have to do that. Can anyone help me figure > out what I am doing wrong?I believe there are two different color specifications. When you write col=<number>, you get one of 8 "basic" colors: black, red, green, blue, turquoise, magenta, yellow, and grey. See this example: plot(c(1:30), pch = 21, bg = c(1:30), col = c(1:30)) If the number is higher than 8, you get the (number-1) mod 8 + 1 color. That would explain why you get grey for 552, "bright pink" (really magenta) for 254, and red for 26. If you want to get the colors listed by colors(), simply specify col colors()[c(552, 254, 26)]. Add as many numbers to the 552, 254, 26 as you need. Hope this helps, Peter
Not reading the documentation for color specification? Integers do not specify
offsets in the colors() table.
?par
If you do want offsets into the colors table, perhaps you should do just that?
..., col=colors()[ c( 552, 254, 26 )], ...
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Katharine Miller - NOAA Federal <katharine.miller at noaa.gov>
wrote:>Hello,
>
>I am having difficulty obtaining the correct colors in my R charts.
>
>> colors()[c(552, 254, 26)]
>[1] "red" "green" "blue"
>
>But, if I specify col=552 in my barplot, I get gray bars. Likewise,
>col=254 gives bright pink, and col=26 is a red-orange. I get accurate
>results when I spell out the names, but I am making a pallet with 20-
>30
>colors and it is a real pain to have to do that. Can anyone help me
>figure
>out what I am doing wrong?
>
>Thanks
>
> [[alternative HTML version deleted]]
>
>______________________________________________
>R-help at 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.