diag Create diagonal matrix or get diagonal elements of matrix

diag in Julia is basically identical:

julia> using LinearAlgebra

julia> M = [11 12 13; 21 22 23; 31 32 33]
3×3 Array{Int64,2}:
 11  12  13
 21  22  23
 31  32  33

julia> diag(M)
3-element Array{Int64,1}:
 11
 22
 33

julia> diag(M, 1)
2-element Array{Int64,1}:
 12
 23

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