XpressMP

The Xpress-MP 2003 optimization system also accepts MPS file input. The Xpress-Optimizer can solve linear, integer, quadratic or mixed integer quadratic programming problems (LP, MIP, QP, MIQP).

We also encourage you to consider using the Xpress-Mosel language interface to the NEOS Server. The Xpress-Mosel language includes the features of a standard programming language, such as loops (forall, while, repeat/until), conditions (if/then/else, case) and procedures/functions, allowing you to perform complex operations, and even algorithms or heuristics that make repeated calls to the Optimizer. The Mosel model may also include statements to set Optimizer control parameters to non-default values.

Mosel may also be used in the manner of a standard modeling language, to export the problem described to an MPS format matrix file. This file can be input manually into the Xpress-Optimizer or a number of other linear or integer programming solvers. For some brief background on algorithms and software for linear and integer programming, the reader is directed to the Optimization Tree area on the NEOS Guide.

For information on Dash products and services, contact them at one of the following addresses:


Dash Optimization
560 Sylvan Avenue
Englewood Cliffs, New Jersey 07632
USA.
Phone: +1 (201) 567 9445
Fax:   +1 (201) 567 9443

Blisworth House
Church Lane
Blisworth
Northants NN7 3BX
UK.
Phone: +44 1604 858 993
Fax:   +44 1604 858 147
info@dashoptimization.com

The email address you provide or use for submissions to Xpress-MP solvers may be forwarded to Dash Optimization for promotional purposes.

Using the NEOS Server with Xpress-MP

To solve a linear programming problem using MPS as input, you need only submit the MPS file. You may also include a list of Xpress-MP commands to customize your use of the optimizer. Visit the Dash Optimization site to register for access to the user manuals.

This NEOS solver executes on a Sun workstation. Sun, Sun Microsystems, the Sun Logo and the Powered by Sun Logo are trademarks or registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries.

MPS file:

You can also submit a parameter file, in Xpress-MP's format, if you wish to override the default parameter settings.
(Your file will be scanned for settings that do not conform to our operational policy for this solver. The possibly modified file will be returned with your output.)
parameter file:

Select whether you want to solve the problem using the SIMPLEX or BARRIER algorithm
Algorithm:

You may specify that your objective should be maximized (the default is minimization).
Maximize?:

You may specify whether your solution should be included or suppressed (the default is to include the solution).
Suppress solution in results?:

An email address is required for any submissions to XPRESS solvers. This email address will be forwarded to Dash Associates and may be used by Dash Optimization for promotional purposes.
Email Address:

>Enter any additional comments here (e.g. to identify the data for your own information.) These comments will be returned with your results.
Comments:

e-mail address:

Please do not click the 'Submit to NEOS' button more than once.

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