Declaring SOS Members

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Declaring SOS Members

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ILOG CPLEX offers you several ways to declare an SOS in a problem:

Use an SOS file, that is one in SOS format, with the file extension .sos. SOS files offer you the most powerful and flexible alternative because the SOS file structure allows you to do several tasks at once:

provide branching priorities for sets,
assign weights to individual set members,
define overlapping sets.

Use SOS declarations within an MPS or LP file (that is, one in MPS format with the file extension .mps or in LP format with the file extension .lp. If you already have MPS files with SOS information, you may prefer this option. Conventions for declaring SOS information in MPS files are documented in the ILOG CPLEX Reference Manual.

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