NEOS Interfaces to qsopt_ex

Sample Submissions


The NEOS Server offers QSopt_EX for the exact solution of linear programming problems.

QSopt_EX was written by Daniel Espinoza. William J. Cook. Sanjeeb Dash. and David Applegate,

Source code and documentation are available from the QSopt-Exact homepage

This solver was implemented by Hans Mittelmann and executes at

Using the NEOS Server for QSopt_EX

The user must submit an LP problem with either rational or real data in either this MPS or this LP format or in AMPL. Note that this QSopt_EX installation runs with default options; the solver can only handle integer variables in very small instances.

Using the NEOS Server for qsopt_ex/AMPL

The user must submit a model in AMPL format. Examples are provided in the examples section of the AMPL website.

The problem must be specified in a model file. A data file and commands files may also be provided. If the commands file is specified, it must contain the AMPL solve command; however, it must not contain the model or data commands. The model and data files are renamed internally by NEOS.

The commands file may include option settings for the solver. To specify solver options, add

  option qsopt_ex_options 'OPTIONS';
where OPTIONS is a list of one or more of the available solver options for AMPL.

Web Submission Form
QSopt_EX data (MPS format file)
Enter the complete path to the MPS file
QSopt_EX data (LP format file)
Enter the complete path to the LP file
AMPL model
Enter the complete path to the AMPL model file (linear, minimization, no commands, no "end")
AMPL data
Enter the complete path to the AMPL data file (optional, no commands)
Problem type
Is the problem an LP or a MIP?
Input data format
Are data real or rational/integer?
Additional Settings

E-Mail address:
Please do not click the 'Submit to NEOS' button more than once.