Struct MIPCtx

pub struct MIPCtx<'a>(/* private fields */);

Callback context object during MIP.

Implementations

impl<'a> MIPCtx<'a>

pub fn terminate(&self)

Signal Gurobi to terminate the optimisation. Will not take effect immediately

pub fn proceed(&mut self)

Generate a request to proceed to the next phase of the computation. Note that the request is only accepted in a few phases of the algorithm, and it won’t be acted upon immediately.

In the current Gurobi version, this callback allows you to proceed from the NoRel heuristic to the standard MIP search. You can determine the current algorithm phase ctx.proceed() (in MIPCtx, MIPNodeCtx and MIPSolCtx).

pub fn set_solution<I, V, T>(&self, solution: I) -> Result<Option<f64>>

where V: Borrow<Var>, T: Borrow<f64>, I: IntoIterator<Item = (V, T)>,

Provide a new feasible solution for a MIP model. Not all variables need to be given. The return value on success has the following meaning, depending from on the callback context:

Context	Possible Values	Meaning
MIPNodeCtx	None	Suggested solution was not feasible.
	Some(val)	Suggested solution was feasible, has objective value of val.
MIPSolCtx	None	No information
MIPCtx	None	No information

On success, if the solution was feasible the method returns the computed objective value, otherwise returns None.

pub fn runtime(&self) -> Result<f64>

Retrieve the elapsed solver runtime in seconds.

pub fn open_scenarios(&self) -> Result<i32>

Number of scenarios that are still open in a multi-scenario model.

pub fn obj_best(&self) -> Result<f64>

Current best objective.

pub fn obj_bnd(&self) -> Result<f64>

Current best objective bound.

pub fn node_cnt(&self) -> Result<f64>

Current explored node count.

pub fn sol_cnt(&self) -> Result<i32>

Current count of feasible solutions found.

pub fn cut_cnt(&self) -> Result<i32>

Current count of cutting planes applied.

pub fn node_left(&self) -> Result<f64>

Current unexplored node count.

pub fn iter_cnt(&self) -> Result<f64>

Current simplex iteration count.

pub fn phase(&self) -> Result<MipPhase>

Current algorithmic phase in the MIP solution