Julia：如何在 plotly 散点图中更改组的颜色

Question

Say I have the following example code

using PlotlyJS
using CSV, DataFrames

df = dataset(DataFrame, "iris")
plot(
    df, x=:sepal_width, y=:sepal_length, color=:species,
    mode="markers"
)

How could I go about specifying the color for each group eg if I want setosa to be yellow instead?

It's exactly this Plotly-Express: How to fix the color mapping when setting color by column name but I need it in julia . I could not get the color_discrete_map to work...

Answer 1

Not quite as convenient as just setting a color_discrete_map , but you can do it like this:

julia> species_color_map = Dict("setosa" => "yellow", "versicolor" => "aqua", "virginica" => "red")
Dict{String, String} with 3 entries:
  "virginica"  => "red"
  "setosa"     => "yellow"
  "versicolor" => "aqua"

julia> plot([scatter(
           subdf,
           x = :sepal_width,
           y = :sepal_length,
           name = subdf[1, :species],
           marker_color = species_color_map[ subdf[1, :species] ],
           mode = "markers"
       )
       for subdf in groupby(df, :species)])