Function GMP::Solution::IsDualDegenerated(GMP, solution)

GMP::Solution::IsDualDegenerated

The function GMP::Solution::IsDualDegenerated checks whether the solution for a generated mathematical program, with model type LP, RMIP or QP, is dual degenerated.

GMP::Solution::IsDualDegenerated(
     GMP,            ! (input) a generated mathematical program
     solution        ! (input) a solution
     )

Arguments

GMP

An element in the set AllGeneratedMathematicalPrograms.

solution

An integer scalar reference to a solution.

Return Value

The function returns 1 if the solution is dual degenerated, and 0 otherwise.

Note

  • A solution is dual degenerated if a non-basic variable has a zero marginal, or if a non-equality constraint is non-basic and has a zero marginal. In that case the primal solution is not unique.

  • This function will always return 0 if the barrier algorithm (without crossover) of CPLEX was used to solve the problem because the barrier algorithm (without crossover) of CPLEX does not provide a basic solution.

See also

The routines GMP::Instance::Generate, GMP::Solution::IsPrimalDegenerated and GMP::Solution::RetrieveFromSolverSession.