How to add count legend on Bar graph using Gadfly?

Specific Domains Visualization
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1

I have created a DataFrame such as

│ Row │ Gender_Code │ N     │
│     │ String      │ Int64 │
├─────┼─────────────┼───────┤
│ 1   │ M           │ 1789  │
│ 2   │ F           │ 205   │

When I applied on it Geom.bar, the bars don’t have the frequency of the M vs F.

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How to add count legend on Bar graph.

2

See the Stat.dodge example in the Gadfly docs.

3

If I have

│ Row │ Age   │ N     │
│     │ Int64 │ Int64 │
├─────┼───────┼───────┤
│ 1   │ 46    │ 3     │
│ 2   │ 45    │ 58    │
│ 3   │ 44    │ 86    │
│ 4   │ 43    │ 131   │

then my command of

num_age_sorted_byFrequency.label = string.(round.(Int, num_age_sorted_byFrequency.N))
Age_Frequency_barplot = plot(num_age_sorted_byFrequency, x=:Age, y=:N, label=:label, Geom.label(position=:centered), Stat.dodge(position=:stack), Geom.bar(position=:stack))

works

But when I have a

│ Row │ Gender_Code │ N     │
│     │ String      │ Int64 │
├─────┼─────────────┼───────┤
│ 1   │ M           │ 1789  │
│ 2   │ F           │ 205   │

and I apply

num_Gender_Code_sorted_byFrequency.label = string.(round.(Int, num_Gender_Code_sorted_byFrequency.N))
Gender_Code_Frequency_barplot = plot(num_Gender_Code_sorted_byFrequency, x=:Gender_Code, y=:N, label=:label, Geom.label(position=:centered), Stat.dodge(position=:stack), Geom.bar(position=:stack))

I get

Error showing value of type Plot:
ERROR: MethodError: no method matching -(::String, ::String)
4

Ok, I see now. In this example with Geom.bar, Stat.dodge isn’t needed:

plot(df, x=:Gender_Code, y=:N, Geom.bar, label=string.(df.N), 
    Geom.label(position=:above))

With Stat.dodge, for some reason it’s necessary to add Scale.x_discrete:

plot(df, x=:Gender_Code, y=:N, label=string.(df.N),
    Geom.label(position=:above),  Stat.dodge, Geom.bar,
    Scale.x_discrete)

and I should investigate why!