Using Solutions from the Solution Pool

ILOG CPLEX 11.0 User's Manual > Discrete Optimization > Solution Pool: Generating and Keeping Multiple Solutions > Using Solutions from the Solution Pool

Using Solutions from the Solution Pool

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The solutions in the solution pool are available for use in applications or further optimizations. For example, you can write a particular solution from the solution pool to a solution file in SOL format.

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In the C++ API, use IloCplex::writeSolution.
In the Java API, use IloCplex.writeSolution.
In the .NET API, use Cplex.WriteSolution.

In the Callable library, use the routine CPXsolwritesolnpool .
In the Interactive Optimizer, use this command, where i represents the index of the solution in the solution pool: write filename.sol i

You can also write all the solutions from the solution pool into a single SOL file.

In Concert Technology

In the C++ API, use IloCplex::writeSolutions.
In the Java API, use IloCplex.writeSolutions.
In the .NET API, use Cplex.WriteSolutions.

In the Callable library, use the routine CPXsolwritesolnpoolall .
In the Interactive Optimizer, use this command: write filename.sol all

You can write a particular solution to a MIP start file in MST format.

In Concert Technology

In the C++ API, use IloCplex::writeMIPStart.
In the Java API, use IloCplex.writeMIPStart.
In the .NET API, use Cplex.WriteMIPStart.

In the Callable Library (C API), use CPXmstwritesolnpool.
In the Interactive Optimizer, use this command, where i represents the index of the solution in the solution pool: write filename.mst i

You can also write all the solutions from the solution pool plus the incumbent to a single MIP start file.

In Concert Technology

In the C++ API, use IloCplex::writeMIPStarts .
In the Java API, use IloCplex.writeMIPStarts .
In the .NET API, use Cplex.WriteMIPStarts.

In the Callable Library (C API), use the routine CPXmstwritesolnpoolall
In the Interactive Optimizer, use this command: write filename.mst all

Similarly, you can use a solution from the solution pool to change the fixed problem of your MIP model. Only these two types are supported for this change:

CPXPROB_FIXEDMILP
CPXPROB_FIXEDMIQP

In Concert Technology

In the C++ API, use IloCplex::solveFixed.
In the Java API, use IloCplex.solveFixed.
In the .NET API, use Cplex.SolveFixed.

In the Callable Library (C API), use the routine CPXchgprobtypesolnpool.
In the Interactive Optimizer, the following command changes the fixed problem to that of the solution at index i in the pool: change problem fixed i

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