NEOS Server Home

NEOS Interfaces to Couenne

WWW Form & Sample Submissions


The NEOS Server offers Couenne for the solution of global optimization problems in AMPL format. Couenne solves global optimization problems using a reformulation-based branch-and-bound algorithm for a globally optimum solution. Additional details and options are available in the Couenne user's manual.

Couenne is developed and maintained by Pietro Belotti and others. Visit the Couenne page at COIN-OR for more details.

Using the NEOS Server with Couenne

The user must submit a model in AMPL format to solve a global optimization problem. The examples section of the AMPL website provides examples of models in AMPL format.

The 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 commands file must not contain the model or data commands. The model and data files are renamed internally by NEOS. Options are specified in a file with one option per line with the format of the name of the option followed by a space and the value.

Web Submission Form
Model File
Enter the location of the AMPL model
Data File
Enter the location of the AMPL data file
Commands File
Enter the location of the AMPL commands file
Options File
Enter the location of the Couenne options 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.