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Example: how to list conflicting constraints #2605

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May 20, 2021
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Example: how to list conflicting constraints #2605

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16 changes: 16 additions & 0 deletions docs/src/manual/solutions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -429,6 +429,7 @@ For instance, this is how you can use this functionality:
using JuMP
model = Model() # You must use a solver that supports conflict refining/IIS
# computation, like CPLEX or Gurobi
# e.g. using Gurobi; model = Model(Gurobi.Optimizer)
@variable(model, x >= 0)
@constraint(model, c1, x >= 2)
@constraint(model, c2, x <= 1)
Expand All @@ -450,6 +451,21 @@ MOI.get(model, MOI.ConstraintConflictStatus(), c2)
new_model, reference_map = copy_conflict(model)
```

Conflicting constraints can be collected in a list and printed
as follows:

```julia
conflict_constraint_list = ConstraintRef[]
for (F, S) in list_of_constraint_types(model)
for con in all_constraints(model, F, S)
if MOI.get(model, MOI.ConstraintConflictStatus(), con) == MOI.IN_CONFLICT
push!(conflict_constraint_list, con)
println(con)
end
end
end
```

## Multiple solutions

Some solvers support returning multiple solutions. You can check how many
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