Set two variables as being complementary.

A complementing variable pair implements the constraint that is equivalent with the product of the variables being zero. However, the solvers may be able to treat such constraints in a special, more efficient ways, which may make a difference if the complementarity constraints are the problematic part of the model. Note that Knitro only allows non-overlapping complementary variables, and in the presence of overlaps Xpress will default to use SLP. Complementary variables must have a lower bound of zero.

setinitval, setinitsb, setdetrow, setenforcedctr.

mmxnlp