When I build a matrix from columns using vcat, the type of the columns is
sometimes modified, e.g.
julia> [[1:3] float([1:3])]
3x2 Array{Float64,2}:
1.0 1.0
2.0 2.0
3.0 3.0
Here the first column of integers has been converted to float. How can I
prevent this conversion so as to obtain
3x2 Array{Any,2}: # or Array{Real,2} since Real is the join type here
1 1.0
2 2.0
3 3.0
I don't care about the type of the resulting array. The point here is not
losing the information concerning the types of the columns. Sincerely,
