The NEOS Server offers IPOPT for the solution of nonlinear programs.
Problems can be submitted to IPOPT on the NEOS server in AMPL or GAMS
IPOPT is an open-source software package for large-scale nonlinear
optimization. It implements a primal-dual interior point algorithm, which
uses a filter line-search method to ensure global convergence.
The main authors of IPOPT are Andreas Wächter and Carl Laird, with
additional development by Lorenz T. Biegler, Arvind Raghunathan, and Yi-Dong
For more information, see the IPOPT home page. A list of
papers and publications describing the algorithm is available here.
The user must submit a model in NL format. The NEOS Server will
automatically handle an NL model in either binary or text
format. NL files in either format can additionally be zipped,
gzipped, or tarred prior to submission if desired.
An options file can optionally be specified. Please note that certain
options may be restricted, altered, or removed by the NEOS server
prior to solving. For example, users are limited to a max of four
solver threads -- requests for more threads in the options file
will not be honored.