How to add Integer contraint to variables using the @variables macro?

Specific Domains Optimization (Mathematical)
2

You can do

@variables trmodel begin
    x[p in plants, m in markets] >= 0, (base_name="shipment quantities in cases", integer=true)
end

or

@variables trmodel begin
    x[p in plants, m in markets] >= 0, (integer=true,)
end

if there is only one keyword argument.
See https://github.com/JuliaOpt/JuMP.jl/blob/79a4fe4d4fc11bc96b62a88b085734429a833dd2/src/macros.jl#L847-L848

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