- Function GMP::Solution::IsDualDegenerated(GMP, solution)¶
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 )
An element in the set
An integer scalar reference to a solution.
The function returns 1 if the solution is dual degenerated, and 0 otherwise.
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.