How to hand-craft an edge into a Pluto's a computational graph?

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Fun question! The “official” answer to the question in the title is: create variables! Pluto only tracks assignments and references, so that’s the mechanism you need to use to tell Pluto about extra edges.

The example from abraemer will work, also when n is even.

x = collect(1:10)

n = 3

begin
    modification_done = nothing
    if isodd(n)
        x[1:2:n] .= 37
    end
end

begin
    # reference this variable to create the reactive edge
    modification_done
    sum(x)
end

But I think that a solution that uses copy like contradict suggested is probably better, as this eliminates any surprises when working on one of the intermediate cells.

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