The nonlinear complementarity or NCP functions were introduced by Mangasarian and these functions are proved to be useful in constrained optimization and elsewhere. Interestingly enough there are only two general methods to derive such functions, while the known or used NCP functions are either...

This paper contains a GAUSS program that can be used, among other things, to find equilibria for computable general equilibrium models, and fix-price equilibria for general non-Walrasian models. Simple applications for those two cases, as well as for linear and quadratic programming, are also...