The Nonlinear Programming Solver
| Macro Variable _OROPTMODEL_ |
The OPTMODEL procedure always creates and initializes a SAS macro variable called _OROPTMODEL_, which contains a character string. After each PROC OPTMODEL run, you can examine this macro variable by specifying %put &_OROPTMODEL_; and check the execution of the most recently invoked solver from the value of the macro variable. After the NLP solver is called, the various terms of the variable are interpreted as follows:
- STATUS
-
indicates the solver status at termination. It can take one of the following values:
- OK
The solver terminated normally.
- SYNTAX_ERROR
The use of syntax is incorrect.
- DATA_ERROR
The input data are inconsistent.
- OUT_OF_MEMORY
Insufficient memory was allocated to the procedure.
- IO_ERROR
A problem in reading or writing of data has occurred.
- SEMANTIC_ERROR
An evaluation error, such as an invalid operand type, has occurred.
- ERROR
The status cannot be classified into any of the preceding categories.
- SOLUTION_STATUS
-
indicates the solution status at termination. It can take one of the following values:
- OPTIMAL
The solution is optimal.
- CONDITIONAL_OPTIMAL
The optimality of the solution cannot be proven.
- BEST_FEASIBLE
The solution returned is the best feasible solution. This solution status indicates that the algorithm has converged to a local optimum but a feasible (not locally optimal) solution with a better objective value has been found and hence is returned.
- INFEASIBLE
The problem is infeasible.
- UNBOUNDED
The problem might be unbounded.
- INFEASIBLE_OR_UNBOUNDED
The problem is infeasible or unbounded.
- BAD_PROBLEM_TYPE
The problem type is not supported by the solver.
- ITERATION_LIMIT_REACHED
The maximum allowable number of iterations has been reached.
- TIME_LIMIT_REACHED
The solver reached its execution time limit.
- FAILED
The solver failed to converge, possibly due to numerical issues.
- OBJECTIVE
indicates the objective value that is obtained by the solver at termination.
- INFEASIBILITY
indicates the level of infeasibility of the constraints at the solution.
- OPTIMALITY_ERROR
indicates the norm of the optimality conditions at the solution. See the section Solver Termination Criterion for details.
- ITERATIONS
indicates the number of iterations required to solve the problem.
- PRESOLVE_TIME
indicates the real time taken for preprocessing (seconds).
- SOLUTION_TIME
indicates the real time taken by the solver to perform iterations for solving the problem (seconds).