Very simple statistic needed

Specific Domains Statistics
1

I have a very simple task: I have a list of CAN bus addresses like this:

1236454-element Vector{Union{Missing, Int64}}:
 65
 65
 48
 48
 49
 49
 50
 50
  ⋮
 57
 65
 58
 58
 65
 59
 59

Because all numbers are below 128 their can be max 128 different elements, in reality less.

I would like to know:
a. which value appears how often
b. perhaps a histogram

I could write that from the scratch, but I guess some library functions might help.

Any suggestions?

2

I think you want StatsBase.countmap().

3 Likes
3

Thanks. That is working nicely!

Only question that remains is how to plot the resulting dictionary as histogram…

4

Check out StatsPlots.jl

julia> cm = countmap(rand(1:5, 100))
Dict{Int64, Int64} with 5 entries:
  5 => 29
  4 => 17
  2 => 20
  3 => 14
  1 => 20

julia> histogram(cm)

image
image1000×718 9.58 KB

EDIT: I just realized it plots the “transpose” of what you probably want :stuck_out_tongue:

5

Just calling Plots.histogram also works

histogram(rand(1:5, 100))

image
image979×721 8.25 KB

6

Not yet working for me, I guess because the type of the vector is

Vector{Union{Missing, Int64}}

EDIT:
This code works:

a = collect(skipmissing((ds.NodeID)))
Plots.histogram(a)
2 Likes
7

Yes. There is an issue here tracking things.