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NEOS Interfaces to CPLEX

WWW Form & Sample Submissions


The NEOS Server offers the IBM ILOG CPLEX Optimizer for the solution of linear programming (LP) problems that can be modeled in AMPL format.

For information on IBM Decision Optimization products, including the CPLEX Optimizer, visit IBM Decision Optimization.

For information on all IBM software available to academics, visit the IBM Academic Initiative.

Using the NEOS Server with AMPL/CPLEX

The user must submit a model in AMPL format to solve a linear program. The examples section of the AMPL website provides examples of models in AMPL format.

The LP problem 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. However, the command file must not contain the model or data commands. The model and data files are renamed internally by NEOS.

Note: An email address is required for any submissions that use CPLEX. This email address will be forwarded to IBM and may be used by IBM for promotional purposes. If using the XML-RPC interface, you must add the line <email></email> into the XML file that is sent to NEOS.

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

 option cplex_options 'OPTIONS'; 
where OPTIONS is a list of one or more of the CPLEX options, which are listed at AMPL/CPLEX Options.

Web Submission Form
Model File
Enter the location of the AMPL model file (local file)
Data File
Enter the location of the AMPL data file (local file)
Commands File
Enter the location of the AMPL commands file (local file)
Additional Settings
Dry run: generate job XML instead of submitting it to NEOS
Short Priority: submit to higher priority queue with maximum CPU time of 5 minutes
E-Mail address:
Please do not click the 'Submit to NEOS' button more than once.