Repeating (with function repeat) array elements using a vector of numbers

General Usage
2

One option:

julia> x=[0.1; 0.6; 0.5]; v=[3; 1; 2];

julia> vcat(fill.(x, v)...)
6-element Array{Float64,1}:
 0.1
 0.1
 0.1
 0.6
 0.5
 0.5
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