Gadfly and custom group colors

Specific Domains Visualization
1

using Gadfly, DataFrames

x=[1,2,3,4,5,6]
y=[6,5,4,3,2,1]
group=[“a”, “b”, “a”, “b”,“a”, “b”]
df=DataFrame(x=x, y=y, group=group)
Gadfly.plot(df, x=:x,
y=:y,
color=:group,
Geom.point,
Theme(background_color=“ghostwhite”,
point_size=6pt))

I would like to set the color of “a” and “b” to “lightsalmon” and “gold” respectively. The Gadfly documentation indicates the following:

Colors can also be specified explicitly for each data point with a vector of colors of length(x). A vector of length one specifies the color to use for all points. Default is Theme.default_color

How is this implemented? Thank you for the help!

2

The Gadfly doc text is talking about how you can pass a vector of colorants to the color aesthetic e.g. color=[colorant"lightsalmon", ..., colorant"gold"] (which is an option). For your example above, you are probably looking for Scale.color_discrete_manual.