Reducing model building time

Specific Domains Optimization (Mathematical)
,
5

Hi @odow,
Defining variables using for loop gives me the following error:

using JuMP
model = Model()
for k in 1:10
    if demanding_computation(k) == 0
        for i in 1:10, j in 1:10
            @variable(model, x[i,j,k])
        end
    end
end

This gives me the following error:

ERROR: An object of name x is already attached to this model. If this
    is intended, consider using the anonymous construction syntax, e.g.,
    `x = @variable(model, [1:N], ...)` where the name of the object does
    not appear inside the macro.

    Alternatively, use `unregister(model, :x)` to first unregister
    the existing name from the model. Note that this will not delete the
    object; it will just remove the reference at `model[:x]`.

Any way around this (I still want to use for loop)? Thanks!