Cut Pool Manager
This section contains the functions and procedures of the Xpress Optimizer cut manager. For a detailed description of the cut manager and its functionality the user is referred to the Xpress Optimizer Reference Manual. To run the cut manager from Mosel, it may be necessary to (re)set certain control parameters of the optimizer. For example, switching off presolve and automatic cut generation, and reserving space for extra rows in the matrix may be useful:
setparam("XPRS_presolve", 0); ! Switch presolve off...
setparam("XPRS_presolveops", 2270); ! ...or use secure setting for presolve
setparam("XPRS_cutstrategy", 0); ! Switch automatic cut generation off
setparam("XPRS_extrarows", 5000); ! Reserve space for 5000 extra rows in
! the matrix The callback functions and procedures that are relevant to the cut manager are initialized with function setcallback, in common with the other Optimizer callbacks.
It should be noted that cuts are not stored by Mosel but sent immediately to the Optimizer. Consequently, if a problem is reloaded into the Optimizer, any previously defined cuts will be lost. In Mosel, cuts are defined by specifying a linear expression (i.e. an unbounded constraint) and the operator sign (inequality/equality). If instead of a linear expression a constraint is given, it will also be added to the system as an additional constraint.
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Add a cut to the problem in the optimizer.
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Add an array of cuts to the problem in the optimizer.
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Add a cut to the optimizer's internal cut pool.
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Add an array of cuts to the optimizer's internal cut pool.
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Delete cuts from the problem in the optimizer.
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Drop a set of cuts from the cut pool.
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Get the set of cuts active at the current node.
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Get a set of cut indices from the cut pool.
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Load a set of cuts into the problem in the optimizer.
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Store a cut into the cut pool.
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Store an array of cuts into the cut pool.
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