Procedure GMP::Solution::SetMIPStartFlag(GMP, solution, flag, effortLevel)

GMP::Solution::SetMIPStartFlag

The procedure GMP::Solution::SetMIPStartFlag can be used to mark a solution in the solution repository of a generated mathematical program such that it should be used as a MIP start during the a MIP solve (or a MIQP or MIQCP solve).

GMP::Solution::SetMIPStartFlag(
     GMP,            ! (input) a generated mathematical program
     solution,       ! (input) a solution
     flag,           ! (input) a scalar value
     [effortLevel]   ! (optional, default 0) a scalar value
     )

Arguments

GMP

An element in AllGeneratedMathematicalPrograms.

solution

An integer scalar reference to a solution.

flag

A scalar binary value to indicate whether the solution should be marked (value 1) or unmarked (value 0) as MIP start.

effortLevel

A scalar value to specify the level of effort that the solver should apply to the solution when using it as MIP start solution. The default value of 0 indicates that the solver should decide; the other values are explained below.

Return Value

The procedure returns 1 on success, or 0 otherwise.

Note

• This procedure is only supported by CPLEX, Gurobi and COPT.

• The argument effortLevel is only used by CPLEX.

• The levels of effort and their effect as specified by argument effortLevel are:

  • Level 0: The solver decides.

  • Level 1: The solver checks feasibility of the corresponding MIP start.

  • Level 2: The solver solves the fixed LP problem specified by the MIP start.

  • Level 3: The solver solves a subMIP.

  • Level 4: The solver attempts to repair the MIP start if it is infeasible.

  • Level 5: A complete solution is injected without the solver performing the usual checks. If the solution defined by the MIP start is infeasible, behavior is undefined.

See also

The routines GMP::Instance::Generate.