Filter Files

ILOG CPLEX 11.0 User's Manual > Discrete Optimization > Solution Pool: Generating and Keeping Multiple Solutions > Filtering the Solution Pool > Filter Files

Filter Files

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You can store filters in a file, known as a filter file, distinguished by the file extension .flt. The same filter file can contain several filters, including both diversity filters and range filters. For documentation of the format of a filter file, see FLT File Format: Filter Files for the Solution Pool in the ILOG CPLEX File Format Reference Manual.

To create filters, use your favorite text editor to create a file formatted according to the specifications in FLT File Format: Filter Files for the Solution Pool.

To install filters declared in a filter file, use one of these methods, routines, or commands:

In Concert Technology, use the methods:

IloCplex::readFilters
IloCplex.readFilters
Cplex.ReadFilters

In the Callable Library (C API), use the routine CPXreadcopysolnpoolfilters to add diversity or range filters.
In the Interactive Optimizer, use the read command to import a filter file.

To write existing filters to a formatted file (for example, for re-use later), use these methods, routines, or commands:

In Concert Technology, use the methods:

IloCplex::writeFilters in the C++ API;
IloCplex.writeFilters in the Java API;
Cplex.WriteFilters in the .NET API.

In the Callable Library (C API), use the routine CPXfltwrite.
In the Interactive Optimizer, use the write command with the file type option flt to create a filter file of the filters currently associated with the solution pool. For example, the following command creates a file named filename.flt containing the filters associated with the solution pool: write filename flt

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