Either-Or constraints in LPsolveAPI

Question

I'm currently writing a MIP in LPsolveAPI in R. The program itself is straightforward, but I can't find a way to write an either-or constraint without being able to directly call a new binary variable or the binary values on the lhs. Does LPsolveAPI not support this or am I missing something obvious?

Answer 1

The use of new binary variables is the standard way to model either-or-constraints in lp_solve. (LpSolveAPI is based on the lp_solve solver.). So you are not missing anything obvious.

That said, one thing that might help you, depending on your constraints is the use of SOS (Special Ordered Sets). Check out the reference to SOS in lp_Solve.