How to define an array whose elements are manually defined type?

General Usage
2

const B = Array{Mean_covar,1}(undef, 10) works well because Array’s are mutable.

Input:

mutable struct Mean_covar
    mu::Array{Float64,2}
    sigma::Array{Float64,2}
    w::Float64 
end

const B = Array{Mean_covar,1}(undef, 5)
display(B)

Output:

5-element Vector{Mean_covar}:
 #undef
 #undef
 #undef
 #undef
 #undef

Input:

B[1] = Mean_covar(zeros(2,2), zeros(2,2), 0.0)
display(B)

Output:

5-element Vector{Mean_covar}:
    Mean_covar([0.0 0.0; 0.0 0.0], [0.0 0.0; 0.0 0.0], 0.0)
 #undef
 #undef
 #undef
 #undef
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