How to make a series optional in AlgebraOfGraphics.jl

Specific Domains Visualization
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2

With a wide dataframe and vectors you’d have to conditionally place or not place elements in these vectors to “toggle” them. I find that Julia doesn’t make this particularly pretty, you can either push! or vcat conditionally or you can splat empty vectors like ["A", (condition ? ["B"], [])...].

But you can do the two-layer approach you were trying, to make the color correct you just cannot use dims in that case. Instead, each layer needs its own categorical color value. But the direct helper makes this easier because you don’t have to add columns just for those categorical values. The code then becomes:

df = let
    t = range(0, 9, length = 1000)
    mass_lab_frame = @. cos(t)^2
    mass_col_frame = @. sin(t)^2
    (; t, mass_lab_frame, mass_col_frame)
end

mappings = mapping(:t, :mass_lab_frame => "observed mass", color = direct("Lab frame"))
if true
    mappings += mapping(:t, :mass_col_frame => "observed mass", color = direct("Collider frame"))
end

data(df) * mappings * visual(Lines) |> draw

grafik
grafik1038×774 103 KB

And with if false:

grafik
grafik1044×778 63.1 KB

The repetition that remains is :t and => "observed mass" but I don’t see a quick way around that right now, other than storing "observed mass" in a variable and pairing that.