The NEOS Server offers LOQO for the solution of nonlinearly
constrained optimization problems in AMPL
format. LOQO is based on an infeasible primal-dual interior-point method
and solves both convex and nonconvex optimization problems. Additional
information for LOQO is available in the
LOQO User's Manual (Version 4.05).
LOQO was developed by Robert J.
Vanderbei and Hande Y.
Using the NEOS Server with LOQO
The user must submit a model in AMPL
format to solve a nonlinear problem.
Examples of models in AMPL format can be found in the
The nonlinear program must be specified by a model file with the options
of a data file and a commands file.
If the commands file is specified,
it must contain the AMPL solve command.
It must not contain the model or data
commands. The model and data files are renamed internally by NEOS.
The commands file may include AMPL commands or set solver options
for LOQO. To specify solver options, add
option loqo_options "OPTIONS";
where OPTIONS is a list of one or more of the LOQO options, which are listed
in the LOQO Options for AMPL.