NEOS Server Home

NEOS Interfaces to BDMLP

Sample Submissions
WWW Form - Email - XML-RPC


The NEOS Server offers the GAMS/BDMLP solver for the solution of linear programming (LP) problems. Problems for BDMLP can be submitted on NEOS in GAMS format.

GAMS/BDMLP is a free Simplex-based LP solver and is intended for small- to medium-sized models. BDMLP can solve reasonably sized models as long as the models are not too degenerate and are well-scaled.

GAMS/BDMLP was originally developed at the World Bank by T. Brooke, A. Drud, and A. Meeraus and is now maintained by GAMS Development. Further information on BDMLP can be found on the GAMS documentation website.

Using the NEOS Server for BDMLP/GAMS

The user must submit a model in GAMS format to solve an optimization problem. For security purposes, the model submitted must adhere to the following conventions:

If you are unfamiliar with GAMS, the GAMS Documentation includes a GAMS Tutorial and User's Guide. Examples of models in GAMS format can be found in the GAMS model library.

By default, the NEOS Server limits the amount of output generated in the listing file by turning off the symbol and unique element list, symbol cross references, and restricting the rows and columns listed to zero. This behavior can be changed by specifying the appropriate options in the model file. See the documentation on GAMS output for further information.

You may optionally submit an options file if you wish to override the default parameter settings for the solver. Currently, the NEOS Server can only use optfile=1 with GAMS input. Therefore, any model that specifies a different options file will not work as intended.

Web Submission Form
Model File
To submit a linear programming problem specified in the GAMS modeling language, you need to specify the absolute path to a GAMS file on your system.
Options File
The Options file is optional and requires that the statement <modelname>.optfile = 1 ; exist before the solve statement in your model file. At this time, only optfile = 1 is supported; however, options may also be specified within the model input file (see the GAMS documentation).
GDX File
The GDX file is an optional file for inputs. It will be renamed to in.gdx. The model must include "$GDXIN in.gdx" to load this file.
Return GDX output
Return log file
You may enter any additional comments here, for example, to identify the data for your own information. These comments will be returned with your results.
Additional Settings

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