📂Julia

How to Weight and Random Sample in Julia

Overview

The usage of the function sample() which serves a similar role to R’s sample() or Python package numpy’s random.choice(), and the Weights function in Julia.

Code ¹

using StatsBase
items = 0:5
weights = 0:5
sample(items, Weights(weights))

# With replacement
my_samps = sample(items, Weights(weights), 10)
# Without replacement
my_samps = sample(items, Weights(weights), 2, replace=false)

Execution Result

julia> using StatsBase

julia> items = 0:5
0:5

julia> weights = 0:5
0:5

julia> sample(items, Weights(weights))
5

julia> # With replacement

julia> my_samps = sample(items, Weights(weights), 10)
10-element Array{Int64,1}:
 4
 3
 2
 1
 3
 3
 5
 5
 2
 2

julia> # Without replacement

julia> my_samps = sample(items, Weights(weights), 2, replace=false)
2-element Array{Int64,1}:
 4
 5

Environment

• OS: Windows
• julia: v1.5.0