ILOG CPLEX 11.0 Parameters Reference Manual > > Alphabetic List of Parameters > MIP starting algorithm |
MIP starting algorithm |
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C Name
CPX_PARAM_STARTALG
C++ Name
RootAlg
Java Name
RootAlg
.NET Name
RootAlg
InteractiveOptimizer
mip strategy startalgorithm
Identifier
2025
Description
Sets which continuous optimizer will be used to solve the initial relaxation of a MIP.
The default Automatic setting (0 zero) of this parameter currently selects the dual simplex optimizer for root relaxations for MILP and MIQP. The Automatic setting may be expanded in the future so that CPLEX chooses the algorithm based on additional characteristics of the model.
For MILP (integer constraints and otherwise continuous variables), all settings are permitted.
For MIQP (integer constraints and positive semi-definite quadratic terms in the objective), settings 5 (Sifting) and 6 (Concurrent) are not implemented; if you happen to choose them, setting 5 (Sifting) reverts to 0 (ero) and setting 6 (Concurrent) reverts to 4.
For MIQCP (integer constraints and positive semi-definite quadratic terms among the constraints), only the Barrier Optimizer is implemented, and therefore no settings other than 0 (zero) and 4 are permitted.
Values
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