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PreDual

Controls presolve model dualization
 Type: int
 Default value: -1
 Minimum value: -1
 Maximum value: 2

Controls whether presolve forms the dual of a continuous model. Depending on the structure of the model, solving the dual can reduce overall solution time. The default setting uses a heuristic to decide. Setting 0 forbids presolve from forming the dual, while setting 1 forces it to take the dual. Setting 2 employs a more expensive heuristic that forms both the presolved primal and dual models (on two threads), and heuristically chooses one of them.

Note: Mainly affects LP, QP, and QCP models, but it is also used for the initial root relaxation of mixed integer programs.

For examples of how to query or modify parameter values from our different APIs, refer to our Parameter Examples.

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