Example: Using SOS and Priority

ILOG CPLEX 11.0 User's Manual > Discrete Optimization > Using Special Ordered Sets (SOS) > Example: Using SOS and Priority

Example: Using SOS and Priority

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These examples illustrate how to use SOS and priority orders.

ilomipex3.cpp

This example derives from ilomipex1.cpp. The differences between that simpler MIP example and this one are:

The problem solved is slightly different so the output is interesting. The actual SOS and priority order that the example implements are arbitrary; they do not necessarily represent good data for this problem.
The routine setPriorities sets the priority order.

mipex3.c

This example derives from mipex1.c. The differences between that simpler MIP example and this one are:

The problem solved is slightly different so the output is interesting. The actual SOS and priority order that the example implements are arbitrary; they do not necessarily represent good data for this problem.
The ILOG CPLEX preprocessing parameters for the presolver and aggregator are turned off to make the output interesting. Generally, this is not required nor recommended.
The routine setsosandorder sets the SOS and priority order:

It calls CPXcopysos to copy the SOS into the problem object.
It calls CPXcopyorder to copy the priority order into the problem object.
It writes the priority order to files by calling CPXordwrite.

The routine CPXwriteprob writes the problem with the constrainnts and SOSs to disk before the example copies the SOS and priority order to verify that the base problem was copied correctly.

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