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Add C API from JuMP to README #537

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Add C API from JuMP to README #537

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28 changes: 28 additions & 0 deletions README.md
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Expand Up @@ -179,6 +179,34 @@ julia> pValue[]
1.5
```

### The C API from JuMP

You can call the C API from JuMP if you use `direct_model`. This is most useful
for adding `GRBaddgenXXX` constraints. Here are some examples:

```julia
using JuMP, Gurobi
column(x::VariableRef) = Gurobi.c_column(backend(owner_model(x)), index(x))
model = direct_model(Gurobi.Optimizer())
@variable(model, x)
@variable(model, y)
p = [3.0, 0.0, 0.0, 7.0, 3.0]
GRBaddgenconstrPoly(backend(model), C_NULL, column(x), column(y), 5, p, "")
optimize!(model)
```

```julia
using JuMP, Gurobi
column(x::VariableRef) = Gurobi.c_column(backend(owner_model(x)), index(x))
model = direct_model(Gurobi.Optimizer())
@variable(model, x[i in 1:2])
@variable(model, y[1:2])
GRBaddgenconstrPow(backend(model), "x1^0.7", column(x[1]), column(y[1]), 0.7, "")
GRBaddgenconstrPow(backend(model), "x2^3", column(x[2]), column(y[2]), 3.0, "")
@objective(model, Min, y[1] + y[2])
optimize!(model)
```

## Reusing the same Gurobi environment for multiple solves

When using this package via other packages such as [JuMP.jl](https://github.com/jump-dev/JuMP.jl),
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