How to do MINLP?

[anon]

Can anyone give me an example of MINLP in action using JuMP, including what solver you're using.

I've tried both KNITRO and CoinOptServices, for example:

using JuMP

using CoinOptServices

model = Model()

@variable(model, 0 <= n <= 5, Int)

@NLobjective(model, Max, exp(n))

solve(model, suppress_warnings=true)

println(getvalue(n))

But including the integer constraint in the @variable results in the error:

Error: LoadError: Solver does not support discrete variables

[Changhyun Kwon]

You can use CouenneNLSolver() or BonminNLSolver() via AmplNLWriter.jl package.

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[anon]

@Changhyun Kwon 

Thanks! that did it.