Summing a vector of vectors in a non-allocating way

General Usage Performance
,
5

In any case, be aware of this:

julia> x = repeat([[0,0]],3)
3-element Vector{Vector{Int64}}:
 [0, 0]
 [0, 0]
 [0, 0]

julia> x[1][1] = 1
1

julia> x
3-element Vector{Vector{Int64}}:
 [1, 0]
 [1, 0]
 [1, 0]

use a comprehension probably:

julia> x = [ [0,0] for _ in 1:3 ]
3-element Vector{Vector{Int64}}:
 [0, 0]
 [0, 0]
 [0, 0]

julia> x[1][1] = 1
1

julia> x
3-element Vector{Vector{Int64}}:
 [1, 0]
 [0, 0]
 [0, 0]
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