Can I create a null JuMP.VariableRef?

Specific Domains Optimization (Mathematical)
,
1

I can pre-allocate a JuMP.AffExpr(0.).

But can I create a dumb x = JuMP.VariableRef(undef)?

Then I can write something like

v = JuMP.Containers.@container([i=1:3], x)
for i = 1:3
    if i !== 3
       v[i] = JuMP.@variable(m) # this is real decision variable that has a Gurobi_c_index
    end
end
2

No