Anyの配列による速度劣化

Anyの配列による速度劣化.ipynb

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      "source": "using Statistics, BenchmarkTools\n\nfunction rnorm(N)\n    A = [] # <------- 問題有り！\n    for i in 1:N\n        push!(A, randn())\n    end\n    A # <------- Anyの配列が返される\nend\n\nA_Any = rnorm(10^7)\n@show typeof(A_Any), length(A_Any)\n\nA_Float64 = Vector{typeof(A_Any[begin])}(A_Any)\n@show typeof(A_Float64), length(A_Float64)\n\nmeansquare(A) = mean(x -> x^2, A)\n\nprint(\"Vector{Any}:    \")\n@btime meansquare($A_Any)\nprint(\"Vector{Float64}:\")\n@btime meansquare($A_Float64)",
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          "text": "(typeof(A_Any), length(A_Any)) = (Vector{Any}, 10000000)\n(typeof(A_Float64), length(A_Float64)) = (Vector{Float64}, 10000000)\nVector{Any}:      789.277 ms (30000004 allocations: 457.76 MiB)\nVector{Float64}:  4.339 ms (0 allocations: 0 bytes)\n",
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