I am trying convert Vector{Any} to Tuple of Floats using function Tuple julia> N = Any[5,2,3,4,4,5,0,1,5,6,9,7,8,9,9,20,2,2,6,6,5,4,5,6,8,5,4]; julia> Tuple{Float64}(N) (5.0,) How to convert the Vector N to Tuple of Floats in all elements (without loops)?

Other variants: Float64.(Tuple(N)) or Float64.(tuple(N...)) julia> @btime Float64.(Tuple($N)) 895.109 ns (5 allocations: 1.22 KiB) julia> @btime Float64.(tuple($N...)) 840.075 ns (4 allocations: 912 bytes) (on julia-0.7)

This is very useful! Should be in the docs about tuples.

julia> @btime Tuple(Float64(x) for x in N); 5.474 μs (57 allocations: 1.42 KiB) julia> @btime Tuple(1.0N); 2.167 μs (90 allocations: 2.31 KiB) 1.5X more allocations with 2.5X more speed!

Interesting. On Julia 0.6.4 I get: julia> @btime Tuple(Float64(x) for x in N); 5.386 μs (65 allocations: 1.98 KiB) julia> @btime Tuple(1.0N); 20.139 μs (159 allocations: 4.16 KiB) and on 1.0 julia> @btime Tuple(Float64(x) for x in N); 6.836 μs (57 allocations: 1.42 KiB) julia> @btime Tup…

(Julia v1) those ^ benchmark best for various lengths of N, Real types with (a) slightly better than (b) (a) T1.(tuple(Vector{T2}…,)) where {T1<:Real, T2<:Real} (b) T1.(Tuple(Vector{T2}) where {T1<:Real, T2<:Real}

The $ is a particular feature of the BenchmarkTools.jl package, and only valid inside its macros (like @btime). The problem is that global variables in expressions often lead to type instability and extra allocations, and the $ is used to replace such variables/expressions via “interpolation”. See h…

when using BenchmarkTools to time myfunction(x), the x gets a $ in front of itself so the timing macro interprets it as if it were being used in a call rather than as a value given once, at the setup for benchmarking @btime myfunction($x)

Converting Vector{Any} to Tuple of Floats

New to Julia

Elmer_Cusipuma August 20, 2018, 1:19pm 10

Thank you very much for the example.
I have one more question. What is the use of the $ operator before N?

Topic		Replies	Views
Converting Vector to Tuple seems not optimal Performance tuple , memory-allocation	11	967	June 22, 2024
Switching data type in a vector General Usage question	2	292	October 28, 2022
Function array performance Performance	5	520	April 2, 2022
How to passing vargs... to a function without allocation? Performance	4	448	September 6, 2022
How to make splat, map and tuples be efficient Performance tuple , map , splat	3	290	February 7, 2025

Converting Vector{Any} to Tuple of Floats

Related topics