In a base R plot it is possible to specify a color as a number (which refers to the currently defined palette()), or a hex-string, or a name such as 'red', among those listed in colors().
Q1: Is it possible in base R to redefine some of the names in colors() to different hex values, for instance to make 'red' correspond to #EE6677? So that a call like
plot(x = 1:2, y = 1:2, col = 'red')
would yield the same output as
plot(x = 1:2, y = 1:2, col = '#EE6677')
(I'm very aware that this could break many things!)
Q2: Alternatively, is it possible to add and define new color names, for instance a string 'myred' that would correspond to #EE6677? So that a call like
plot(x = 1:2, y = 1:2, col = 'myred')
would yield the same output as
plot(x = 1:2, y = 1:2, col = '#EE6677')
(Note that what I'd like to achieve is different from what can be done by this answer to another question.)
Thank you!
No. This is translated by col2rgb() (e.g. col2rgb("lavender")), and the color table is hard-coded here.
For what it's worth I think this is the same as the X11 color name list, first defined in 1985.