Nonlinear Presolve

Type

Selection

Range

The settings listed below

Default

Off

This option controls whether the AIMMS Presolver is called before solving a nonlinear model. Possible values are:

  • On

  • Off

After calling the Presolver AIMMS will pass the presolved model to the solver. A solution obtained from the solver is translated back to the original model but in general sensitivity and basis information will not be complete.

The amount of reductions that the AIMMS Presolver can do is influenced by the options Presolve Constraints Used, Presolve Dual Reductions and Remove Doubletons, and, in case the model contains binary variables, the option MINLP Probing.

Note

  • The option Linear Presolve controls the AIMMS Presolver for linear, quadratic or quadratically-constrained models.

  • The AIMMS Presolver cannot process constraints that contain an external function and therefore it will ignore such a constraint.

  • The AIMMS Presolver will not be called in case the model is solved using the procedure GMP::SolverSession::AsynchronousExecute.

  • The function GMP::Instance::CreatePresolved will call the AIMMS Presolver underneath (and can also be used for linear, quadratic or quadratically-constrained models).

  • The GMP-AOA module uses the AIMMS Presolver by default by calling the function GMP::Instance::CreatePresolved.

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