8.6.2. Real-number parameters¶

C API parameter	Parameter	Description
MDO_REAL_PARAM_MAX_TIME	“MaxTime”	The maximum solving time.
MDO_REAL_PARAM_SPX_PRIMAL_TOLERANCE	“SPX/PrimalTolerance”	The primal feasible tolerance in the simplex method.
MDO_REAL_PARAM_SPX_DUAL_TOLERANCE	“SPX/DualTolerance”	The dual feasible tolerance in the simplex method.
MDO_REAL_PARAM_IPM_PRIMAL_TOLERANCE	“IPM/PrimalTolerance”	The primal feasible (relative) tolerance in the interior point method (IPM).
MDO_REAL_PARAM_IPM_DUAL_TOLERANCE	“IPM/DualTolerance”	The dual feasible (relative) tolerance in the IPM.
MDO_REAL_PARAM_IPM_GAP_TOLERANCE	“IPM/GapTolerance”	The dual gap (relative) tolerance in the IPM.
MDO_REAL_PARAM_MIP_INTEGER_TOLERANCE	“MIP/IntegerTolerance”	The tolerance of the value of an integer for MILP.
MDO_REAL_PARAM_MIP_OBJECTIVE_TOLERANCE	“MIP/ObjectiveTolerance”	The tolerance of the objective for MILP.
MDO_REAL_PARAM_MIP_GAP_ABS	“MIP/GapAbs”	The allowable gap (absolute) for MILP.
MDO_REAL_PARAM_MIP_GAP_REL	“MIP/GapRel”	The allowable gap (relative) for MILP.
MDO_REAL_PARAM_MIP_LINEARIZATION_BIG_M	“MIP/LinearizationBigM”
MDO_REAL_PARAM_MIP_CUTOFF	“MIP/Cutoff”

In addition, the parameters of C++、Java、Python API are in the namespace of MDO_REAL_PARAM 。

8.6.2.1. “MaxTime”¶

A real-number parameter that specifies the maximum solving time of the solver, in seconds.

Group: Common
Default value: 1.7976931348623158E+308
Value range: [0, ∞)

Note

By default, MindOpt uses the wall clock time for timing.
If the value is set to 0, the solving time is not limited.

Examples

C

Mdo_setRealParam(model, "MaxTime", 7200.0);

C++

model.setRealParam("MaxTime", 7200.0);

Python

model.set_real_param("MaxTime", 7200.0)

8.6.2.2. “SPX/PrimalTolerance”¶

A real-number parameter that specifies the primal feasible tolerance in the simplex method.

Group: simplex method
Default value: 1.E-6
Value range: [1.E-3, 1.E-9]

Examples

C

Mdo_setRealParam(model, "SPX/PrimalTolerance", 1.E-6);

C++

model.setRealParam("SPX/PrimalTolerance", 1.E-6);

Python

model.set_real_param("SPX/PrimalTolerance", 1.E-6)

8.6.2.3. “SPX/DualTolerance”¶

A real-number parameter that specifies the dual feasible tolerance in the simplex method.

Group: simplex method
Default value: 1.E-6
Value range: [1.E-3, 1.E-9]

Examples

C

Mdo_setRealParam(model, "SPX/DualTolerance", 1.E-6);

C++

model.setRealParam("SPX/DualTolerance", 1.E-6);

Python

model.set_real_param("SPX/DualTolerance", 1.E-6)

8.6.2.4. “IPM/PrimalTolerance”¶

A real-number parameter that specifies the primal feasible (relative) tolerance in the IPM.

Group: interior point method
Default value: 1.E-8
Value range: [1.E-1, 1.E-12]

Examples

C

Mdo_setRealParam(model, "IPM/PrimalTolerance", 1.E-8);

C++

model.setRealParam("IPM/PrimalTolerance", 1.E-8);

Python

model.set_real_param("IPM/PrimalTolerance", 1.E-8)

8.6.2.5. “IPM/DualTolerance”¶

A real-number parameter that specifies the dual feasible (relative) tolerance in the IPM.

Group: interior point method
Default value: 1.E-8
Value range: [1.E-1, 1.E-12]

Examples

C

Mdo_setRealParam(model, "IPM/DualTolerance", 1.E-8);

C++

model.setRealParam("IPM/DualTolerance", 1.E-8);

Python

model.set_real_param("IPM/DualTolerance", 1.E-8)

8.6.2.6. “IPM/GapTolerance”¶

A real-number parameter that specifies the dual gap (relative) tolerance in the IPM.

Group: interior point method
Default value: 1.E-8
Value range: [1.E-1, 1.E-12]

Examples

C

Mdo_setRealParam(model, "IPM/GapTolerance", 1.E-8);

C++

model.setRealParam("IPM/GapTolerance", 1.E-8);

Python

model.set_real_param("IPM/GapTolerance", 1.E-8)

8.6.2.7. “MIP/IntegerTolerance”¶

A real-number parameter that specifies the tolerance of the value of an integer for MILP.

Group: milp method
Default value: 1.E-6
Value range: [1.E-9, 1.E-2]

Examples

C

Mdo_setRealParam(model, "MIP/IntegerTolerance", 1.E-9);

C++

model.setRealParam("MIP/IntegerTolerance", 1.E-9);

Python

model.set_real_param("MIP/IntegerTolerance", 1.E-9)

8.6.2.8. “MIP/ObjectiveTolerance”¶

A real-number parameter that specifies the tolerance of the objective for MILP.

Group: milp method
Default value: 1.E-6
Value range: [1.E-9, 1.E-2]

Examples

C

Mdo_setRealParam(model, "MIP/ObjectiveTolerance", 1.E-6);

C++

model.setRealParam("MIP/ObjectiveTolerance", 1.E-6);

Python

model.set_real_param("MIP/ObjectiveTolerance", 1.E-6)

8.6.2.9. “MIP/GapAbs”¶

A real-number parameter that specifies the allowable gap (absolute) for MILP.

Group: milp method
Default value: 1.E-6
Value range: [0, 1.7976931348623158E+308]

Examples

C

Mdo_setRealParam(model, "MIP/GapAbs", 1.E-6);

C++

model.setRealParam("MIP/GapAbs", 1.E-6);

Python

model.set_real_param("MIP/GapAbs", 1.E-6)

8.6.2.10. “MIP/GapRel”¶

A real-number parameter that specifies the allowable gap (relative) for MILP.

Group: milp method
Default value: 1.E-4
Value range: [0, 1.7976931348623158E+308]

Examples

C

Mdo_setRealParam(model, "MIP/GapRel", 1.E-4);

C++

model.setRealParam("MIP/GapRel", 1.E-4);

Python

model.set_real_param("MIP/GapRel", 1.E-4)

8.6.2.11. “MIP/LinearizationBigM”¶

A real-number parameter that specifies MIP中重列非线形函数时的最大系数.

Group: milp method
Default value: 1.E+8
Value range: [0, 1E+10]

Examples

C

Mdo_setRealParam(model, "MIP/LinearizationBigM", 1.E+4);

C++

model.setRealParam("MIP/LinearizationBigM", 1.E+4);

Python

model.set_real_param("MIP/LinearizationBigM", 1.E+4)

8.6.2.12. “MIP/Cutoff”¶

A real-number parameter that specifies MIP中重列非线形函数时的最大系数.

Group: milp method
Default value: 1.7976931348623158E+308
Value range: [-1.7976931348623158E+308, 1.7976931348623158E+308]

Examples

C

Mdo_setRealParam(model, "MIP/Cutoff", 1.E-4);

C++

model.setRealParam("MIP/Cutoff", 1.E-4);

Python

model.set_real_param("MIP/Cutoff", 1.E-4)