ILOG CPLEX 11.0 Parameters Reference Manual > > Alphabetic List of Parameters > Presolve dual setting

C Name

CPX_PARAM_PREDUAL

C++ Name

PreDual

Java Name

PreDual

.NET Name

PreDual

InteractiveOptimizer

preprocessing dual

Identifier

1044

Description

Decides whether CPLEX presolve should pass the primal or dual linear programming problem to the linear programming optimization algorithm. By default, CPLEX chooses automatically.

If this parameter is set to 1 (one), the CPLEX presolve algorithm is applied to the primal problem, but the resulting dual linear program is passed to the optimizer. This is a useful technique for problems with more constraints than variables.

Values

Value 
Meaning 
-1 
Turn off this feature 
Automatic: let CPLEX choose; default 
Turn on this feature