Percentage axis in bar plot Julia

Question

I am using this stacked bar plot example to create a stacked bar plot with a percentage axis. Here is some reproducible code:

using StatsPlots

measles = [38556, 24472, 14556, 18060, 19549, 8122, 28541, 7880, 3283, 4135, 7953, 1884]
mumps = [20178, 23536, 34561, 37395, 36072, 32237, 18597, 9408, 6005, 6268, 8963, 13882]
chickenPox = [37140, 32169, 37533, 39103, 33244, 23269, 16737, 5411, 3435, 6052, 12825, 23332]

ticklabel = string.(collect('A':'L'))
groupedbar([measles mumps chickenPox],
        bar_position = :stack,
        bar_width=0.7,
        xticks=(1:12, ticklabel),
        label=["measles" "mumps" "chickenPox"])

Output:

So now it is a nice stacked values barplot, but I would like to make the y-axis in percentage with range from 0 to 100%. Unfortunately there is no option like scale = :percent. So I was wondering if anyone knows how to make this barplot with percentage y-axis in Julia?

Answer 1

Mabe this can give you a idea:

foo = @. measles + mumps + chickenPox
my_range = LinRange(0, maximum(foo), 11)

groupedbar(
  [measles mumps chickenPox],
  bar_position = :stack,
  bar_width=0.7,
  xticks=(1:12, ticklabel),
  yticks=(my_range, 0:0.1:1),
  label=["measles" "mumps" "chickenPox"]
)

Explanation:
The idea is to map a linear range from zero up to the height of the tallest bar in the plot. So, first I should find the tallest bar in the plot; for this, I should achieve to values of the height of each bar:

julia> foo = @. measles + mumps + chickenPox
12-element Vector{Int64}:
 95874
 80177
 86650
 94558
 88865
 63628
 63875
 22699
 12723
 16455
 29741
 39098

Then, I use the maximum of foo to create my linear range from zero to the maximum value:

julia> my_range = LinRange(0, maximum(foo), 11)
11-element LinRange{Float64, Int64}:
 0.0,9587.4,19174.8,28762.2,38349.6,47937.0,57524.4,67111.8,76699.2,86286.6,95874.0

Now I use this range in the groupedbar function for its keyword argument, named yticks to scale the range 0:0.1:1 to the extremum value of the plot. If you want to change the range from zero to 100 (instead of percent interpretation), then just replace 0:0.1:1 with 0:10:100 in the yticks.