The NEOS Server offers NLPEC for the solution of mixed complementarity
problems in GAMS format. The NLPEC solver
reformulates the complementarity problem as a nonlinear
optimization problem and applies one of the available nonlinear programming
methods to the reformulation.
Documentation for GAMS/NLPEC
is available on the GAMS Solvers website. Details also can be found in papers and technical
reports by the original developers of NLPEC, Michael Ferris and GAMS Development Corporation.
Using the NEOS Server with NLPEC
The user must submit a model in GAMS
format to solve a complementarity problem. For security purposes, the model
submitted must adhere to the following conventions:
If you are unfamiliar with GAMS, the GAMS Documentation includes
a GAMS Tutorial and User's Guide. Examples of models in GAMS
format can be found in the
GAMS Model Libraries.
- It must be self contained, i.e., no $include or $batinclude statements.
- It may not execute external programs, i.e., no $call or execute statements.
- It may not create files, i.e., no put files or $echo statements.
The NEOS Server initially limits the amount of output generated in the
listing file by turning off the symbol and unique element list, symbol
cross references, and restricting the rows and columns listed to zero.
This behavior can be changed by specifying the appropriate options
in the model file. See the documentation on the modeling language for further information.