Julia: Transforming an Array of Arrays in a 2-dimensional Array

If your array of array is supposed to represent a matrix and you want to preserve the logic, then this is the simpler I found (julia 1.1)

julia> a=[ [1,2], [3,4], [5,6] ]
3-element Array{Array{Int64,1},1}:
 [1, 2]
 [3, 4]
 [5, 6]

julia> permutedims(reshape(hcat(a...), (length(a[1]), length(a))))
3×2 Array{Int64,2}:
 1  2
 3  4
 5  6

One could use transpose instead of permutedims.

hcat(d...) and vcat(d...) should do what you want.