Convert struct fields and their values to DataFrames

New to Julia
2

Maybe you had a mistake at fieldnames. It require the struct inself, not instance. Use typeof function to get the name of class(structure).

julia> struct MyStruct
           x::Vector{Float64}
           y::Vector{Float64}
           end

julia> function struct_to_dataframe(s)
           fields = fieldnames(typeof(s))
           still_vector = [getfield(s,field) for field in fields]
           return DataFrame(hcat(still_vector...), collect(fields))
       end
struct_to_dataframe (generic function with 1 method)

julia> s = MyStruct(rand(10),rand(10));

julia> struct_to_dataframe(s)
10×2 DataFrame
 Row │ x         y
     │ Float64   Float64
─────┼──────────────────────
   1 │ 0.286858  0.140575
   2 │ 0.253701  0.821031
   3 │ 0.767813  0.474758
   4 │ 0.669886  0.74336
   5 │ 0.463448  0.956407
   6 │ 0.692433  0.715941
   7 │ 0.520875  0.447658
   8 │ 0.783861  0.00811924
   9 │ 0.928598  0.885618
  10 │ 0.681593  0.271318