Enumeration DeleteMode

This enumeration lists the possible settings for the delete mode of IloCplex as controlled by the method IloCplex::setDeleteMode and queried by the method IloCplex::getDeleteMode.

• IloCplex::LeaveBasis

With the default setting IloCplex::LeaveBasis, an existing basis will remain unchanged if variables or constraints are removed from the loaded LP model. This choice generally renders the basis unusable for a restart when CPLEX is solving the modified LP and the advanced indicator (parameter IloCplex::AdvInd) is set to IloTrue.

• IloCplex::FixBasis

In contrast, with delete mode set to IloCplex::FixBasis, the invoking object will do basis pivots in order to maintain a valid basis when variables or constraints are removed. This choice makes the delete operation more computation-intensive, but may give a better starting point for reoptimization after modification of the extracted model.

If no basis is present in the invoking object, the setting of the delete mode has no effect.