Interfaces to PATH 3.0: Design, implementation and usage

Several new interfaces have recently been developed requiring PATH to solve a mixed complementarity problem. To overcome the necessity of maintaining a different version of PATH for each interface, the code was reorganized us ing object-oriented design techniques. At the same time, robustness issues were considered and enhancements made to the algorithm. In this paper, we d ocument the external interfaces to the PATH code and describe some of the n ew utilities using PATH. We then discuss the enhancements made and compare the results obtained from PATH 2.9 to the new version.