Gurobi with Log constranints

Specific Domains Optimization (Mathematical)
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5

Here you go:

The missing bit was you needed zero-indexed columns as Cint instead of 1 and 2.

using JuMP
using Gurobi

column(model, x) = Cint(Gurobi.column(backend(model), index(x)) - 1)

model = direct_model(Gurobi.Optimizer())
@variable(model, x >= 0.001)
@variable(model, y <= 2)
@objective(model, Max, x)
# y = log(x)
GRBaddgenconstrLog(backend(model), "logCost", column(model, x), column(model, y), "")
optimize!(model)
value(x), value(y)