Static array with uniform distribution

sand · November 30, 2023, 7:46pm

Hello,

I would like to know how to generate a static array with a uniform distribution (-2, 2).

Here is an example:

using StaticArrays
using Distributions

@SVector(randn(5))      # works

rand(Uniform(-2, 2), 5)  # works

@SVector(rand(Uniform(-2, 2), 5)) # does not work

DNF · November 30, 2023, 8:00pm

(rand(SVector{5, Float64}) .- 0.5) .* 4

should work.

stevengj · November 30, 2023, 8:11pm

github.com/JuliaArrays/StaticArrays.jl

Generating random StaticArrays works with SamplerTypes but not other Samplers

opened 11:17PM - 29 Jun 20 UTC

npbarnes

bug

Here's an example taken from the Julia docs on random number generation [here](h…ttps://docs.julialang.org/en/v1/stdlib/Random/#Generating-values-from-a-type-1) ```julia struct Die nsides::Int end Random.rand(rng::AbstractRNG, ::Random.SamplerType{Die}) = Die(rand(rng, 4:20)) Random.rand(rng::AbstractRNG, d::Random.SamplerTrivial{Die}) = rand(rng, 1:d[].nsides) Base.eltype(::type{Die}) = Int ``` This lets us conveniently generate arrays of random dice, ```julia julia> rand(Die,3) 3-element Array{Die,1}: Die(11) Die(17) Die(4) ``` or arrays of random dice rolls ```julia julia> rand(Die(6), 3) 3-element Array{Int64,1}: 3 1 5 ``` With StaticArrays we can generate random dice ```julia julia> @SVector rand(Die, 3) 3-element SArray{Tuple{3},Die,1,3} with indices SOneTo{3}: Die(20) Die(10) Die(13) ``` but not random dice rolls ```julia julia> @SVector rand(Die(6), 3) ERROR: ArgumentError: Static Array parameter T must be a type, got Die(6) Stacktrace: ... ``` The same error occurs when using the samplers from Distributions.jl, for example.