Chart colors

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

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]]

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Michael Sumner
Hobart, Australia
e-mail: mdsumner at gmail.com

On Mon, Dec 9, 2013 at 2:08 PM, Katharine Miller - NOAA Federal

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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Sent from my phone. Please excuse my brevity.

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.