The Interior-Point Methods Online
site is no longer maintained.
If you are looking for recent reports on
interior-point methods (from 2001 onwards), or if you wish to post
your new report on an online archive, please go to
Reports on interior-point methods can be found on this site
in the sections on Linear, Cone and Semidefinite Programming,
Nonlinear Optimization, and other categories. You can also search the Optimization Online
site by author name or keyword.
This archive of interior-point reports will be left online indefinitely.
You are urged to contact the authors to obtain the latest versions of
any reports that catch your interest, or to obtain a reference to the
From here, you can
Other fun things to do:
Here are some pointers to
- home pages of interior-point researchers
- places where interior-point work is done.
To suggest additions to this list (including your own pages) go to our suggestions box.
OSL-IBM's Optimization Subroutine
Library-contains a primal-dual code with a number of algorithmic options.
The Optimization Technology Center at Argonne and
Northwestern, and the NEOS Server,
which includes the linear programming code PCx among its roster of solvers. You can submit
an MPS file to NEOS through the Internet, using email, the WWW, or-the sexiest option-a
customized submission tool. NEOS solves the problem and returns the results.
PCx, the NEOS project's
Home page for the book Primal-Dual
Interior-Point Methods by Steve Wright. Contains links to further information on
Programming Glossary maintained by Harvey Greenberg.
A group of IE students at Berkeley have built a nice interactive demo of linear
programming. It allows you to enter a 2D problem, solve it, and view the results
Graphics has an operations research page, which includes information about a parallel
implementation of CPLEX/Barrier.
Home page for a new book called Advances
in Linear and Integer Programming (J. E. Beasley, ed., Oxford University Press).
This is another collection of papers that includes four or five papers on interior-point
Home page for the book called Theory and
Algorithms for Linear Optimization: An Interior Point Approach by C. Roos, T.
Terlaky, and J.-P. Vial, recently published by John Wiley and Sons.
Home page for the book called Interior
Point Methods of Mathematical Programming (T. Terlaky, editor), recently published
- OOPS, an object-oriented parallel implementation of the interior point
algorithm developed by Jacek Gondzio,
Andreas Grothey and Robert Sarkissian. The code can exploit special structure
of the application. It runs on all parallel computing platforms that
- MOSEK, an implementation of the
homogeneous interior-point algorithm for linear and convex optimization.
- The CPLEX Barrier Solver
page-CPLEX's interior-point option.
- Dash Associates, whose products include the
"Primal Barrier XPRESS-MP," a primal-dual interior-point code.
- The CPnet page (CP = complementarity
problems). The interior-point approach is one of three or four approaches being used to
solve complementarity problems.
- The Math Programming page at the
University of Wisconsin-Madison.
- Semidefinite programming pages are maintained by
- Christoph Helmberg,
- Mike Todd,
- Henry Wolkowicz.
This area is maintained by Nathan Brixius
and Steve Wright at Argonne National
Two undergraduate students at Argonne-Rich Marynowski and Tim Wisniewski-did a lot to
build and maintain this archive during their respective visits. Marianne Stone chipped in
with some tasteful graphics. Thanks!