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NEOS Interfaces to Couenne

WWW Form & Sample Submissions


The NEOS Server offers Couenne for the solution of mixed integer nonlinearly constrained optimization problems (MINLPs) in AMPL format.

Couenne solves MINLPs using a reformulation based branch-and-bound algorithm for a globally optimum solution. Additional details and options are available in the user manual for Couenne.

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

Using the NEOS Server for Couenne

The user must submit a model in AMPL format to solve a nonlinearly constrained optimization problem. Examples of models in AMPL format can be found in the AMPL library .

The model is specified by a model file, and optionally, a data file and a commands file. If the command file is specified it must contain the AMPL solve command. The commands file can contain any AMPL command. Printing directed to standard out is returned to the user with the output.

Web Submission Form
Model File
Enter the location of the ampl model (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)
Options File
Enter the location of the couenne options 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.