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This area contains a collection of links to optimization test problems.

= Complementarity & Equilibrium Problems =

* [http://www.cs.wisc.edu/cpnet/ CPNET: Complementarity Problem Net]
* [http://www.gamsworld.org/mpec/ GAMS-world collection of Mathematical Programs with Equilibrium Constraints]
* [http://www.gamsworld.org/mpsge/ GAMS-world collection of General Equlibrium Models]
* [http://www.mcs.anl.gov/~leyffer/macmpec/ MacMPEC: AMPL collection of Mathematical Programs with Equilibrium Constraints]
* [http://www.mcs.anl.gov/~leyffer/macepec/ MacEPEC: AMPL Collection of Equlibrium Problems with Equilibrium Constraints]

= Linear Problems (LP) =

* [http://www.netlib.org/lp/data/ NETLIB LP Test Set]
* [http://cuter.rl.ac.uk/cuter-www/Problems/netlib.shtml NETLIB LP Test Set in CUTE]

= Mixed Integer Linear Programming (MILP) =

* [http://coral.ie.lehigh.edu/mip-instances/ COR@L Mixed Integer Programming Instances]
* [http://miplib.zib.de/ MIPLIB - Mixed Integer Problem Library]

= Mixed Integer Nonlinear Programming (MINLP) =

* [[DIWAL|DIWAL: Data, Internet, and Wireless Applications Library]] of MINLPs ''(under construction)''
* [http://www.gamsworld.org/minlp/ GAMS-world MINLP problems]
* [http://www.mcs.anl.gov/~leyffer/macminlp/ MacMINLP AMPL collection of MINLPs]
* [http://egon.cheme.cmu.edu/ibm/page.htm Test problems from CMU-IBM open source MINLP project]
* [http://minlp.org/library/index.php Newer version of the above CMU-IBM library]
* [http://plato.asu.edu/ftp/ampl_files/miqp_ampl/ Mixed Integer Quadratic Programming Problems at Hans Mittelmann's Webpage]

= Nonlinear Problems (NLP) =

* [http://www.orfe.princeton.edu/~rvdb/ampl/nlmodels/ Bob Vanderbei's Collection of AMPL test problems]
* [http://www.mcs.anl.gov/~more/cops/ COPS: Large-Scale Optimization Problems]
* [http://www.numerical.rl.ac.uk/cute/mastsif.html CUTEr Test Problems]
* [http://www.gams.com/modlib/modlib.htm GAMS Model Library]
* [http://www.gamsworld.org/global/ Global Optimization in GAMS]
* [http://apmonitor.ath.cx/wiki/index.php/Apps/HockSchittkowski Hock & Schittkowski Test Problems] in <font color="blue">A</font><font color="red">P</font><font color="black">Monitor</font>
* [http://www-rocq.inria.fr/estime/modulopt/libopt/libopt.html LIBOPT: environment for testing solvers on heterogeneous collections of problems]

= Semidefinite Programs (SDP) =
*  [http://infohost.nmt.edu/~sdplib/ SDPLIB 1.2, June 28, 1998]
* [http://dimacs.rutgers.edu/Challenges/Seventh/Instances/ DIMACS library of mixed semidefinite-quadratic programs]
* [http://www2.am.uni-erlangen.de/~kocvara/pennon/problems.html Michal Kocvara's collection of large sparse SDPs]