gurobi() function returns a list as its result. This list
contains a number of components, where each component contains information
about the computed solution. The available components depend on the
result of the optimization, the type of model that was solved (LP, QP,
SOCP, or MIP), and the algorithm used to solve the model. This result list
will always contain an integer
status component, which indicates
whether Gurobi was able to compute an optimal solution to the model.
You should consult the Status Codes section of the
Gurobi Reference Manual
a complete list of all possible status codes. If Gurobi was able to
find a solution to the model, the return value will also include
x components. The former gives the
objective value for the computed solution, and the latter is the
computed solution vector (one entry per column of the constraint
matrix). For continuous models, we will also return dual information
(reduced costs and dual multipliers), and possibly an optimal basis.
For a list of all possible fields and details about when you will
find them populated, refer to the documentation for the
function in the reference manual.
In our example, we simply print the optimal objective value
and the optimal solution vector