As mentioned in Introduction to Presolve, some presolve reductions are invalidated when a problem is modified. The advanced presolve interface therefore allows a user to tell presolve what sort of modifications will be made in the future, so presolve can avoid possibly invalid reductions. These considerations only apply to linear programs. Any modifications of QP or QCP models will cause ILOG CPLEX to discard the presolved model. The following sections document special considerations about presolve reductions.
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