Introduction

NOX is short for Nonlinear Object-Oriented Solutions, and its objective is to enable the robust and efficient solution of the equation: $ F(x)=0 $ , where $F:\Re^n \rightarrow \Re^n$ . NOX implements a variety of Newton-based globalization techniques including Line Search and Trust Region algorithms. In additon it provides higher and lower order models using Broyden and Tensor algorithms. Special algorithms have been developed for use with inexact linear solvers such as Krylov subspace techniques. NOX is designed to work with any linear algebra package and to be easily customized. NOX is part of Sandia's Trilinos project.

LOCA, distributed as part of NOX, is short for Library of Continuation Algorithms, and its objective is to compute families of solutions to $ F(x,p)=0 $ and their bifurcations, where $F:\Re^n\times\Re^m\rightarrow\Re^n$ . For LOCA specific information, see LOCA Overview.

Announcements

NOX/LOCA version 10.2 will be released as part of Trilinos 10.2 in March 2010. Please read the NOX and LOCA Release Information (Last updated March 1st 2010) page for more details on these changes.

Technical Information

NOX and LOCA Release Information (Last updated March 1st 2010) - Latest news and notes on released software.
NOX User Information - Instructions for building and linking NOX and LOCA to your appplication.
NOX Developer Information - Developer reference pages.
Portability Issues - Platform specific issues.

License

NOX is available for download under the terms of the GNU Lesser General Public License.

Downloads

NOX and LOCA are packaged and released as part of the Trilinos Solver Framework. You may download NOX (which includes LOCA) by downloading a copy of Trilinos. Please see the Trilinos downloads page for the latest releases.

Reporting Bugs and Making Enhancement Requests

To reports bugs or make enhancement requests, visit the Trilinos Bugzilla (Bug Tracking) Database, and use the following instructions.

Click on "Enter a new bug report"
Choose "NOX"
Either login or create a new account
Submit your bug report

Mailing Lists

We recommend that users and developers subscribe to the following mailing lists as appropriate.

NOX-Announce Mailing List - Low-volume, primarily for release announcements. (Highly Recommended)
NOX-Users Mailing List - Discussion forum for users of NOX. (Recommended)
NOX-Developers Mailing List - Discussion forum for NOX developers. (Developers)
NOX-Checkins Mailing List - CVS Commit Messages (Active Developers)

NOX & LOCA Contributors

The following people have contributed code to NOX and/or LOCA:

Brett Bader, Sandia National Labs, bwbad.nosp@m.er@s.nosp@m.andia.nosp@m..gov
Russ Hooper, Sandia National Labs, rhoop.nosp@m.e@sa.nosp@m.ndia..nosp@m.gov
Tammy Kolda, Sandia National Labs, tgkol.nosp@m.da@s.nosp@m.andia.nosp@m..gov
Roger Pawlowski, Sandia National Labs, rppaw.nosp@m.lo@s.nosp@m.andia.nosp@m..gov (NOX Project Lead)
Eric Phipps, Sandia National Labs, etphi.nosp@m.pp@s.nosp@m.andia.nosp@m..gov (Primary LOCA developer)
Andy Salinger, Sandia National Labs, agsal.nosp@m.in@s.nosp@m.andia.nosp@m..gov (LOCA Project Lead)
Alex Toth, NC State University

For All Other Questions and Comments...

Please contact Roger Pawlowski (rppaw.nosp@m.lo@s.nosp@m.andia.nosp@m..gov) or Eric Phipps (etphi.nosp@m.pp@s.nosp@m.andia.nosp@m..gov).