NEOS Server Home

NEOS Interfaces to filter

WWW Form & Sample Submissions


The NEOS Server offers filter for the solution of nonlinearly constrained optimization problems in AMPL format. filter is suitable for large nonlinearly constrained problems with a modest number of degrees of freedom.

filter implements a Sequential Quadratic Programming solver that is suitable for solving large nonlinearly constrained problems. Additional information on filter can be found in the User manual for filterSQP. filter was developed by Roger Fletcher and Sven Leyffer.

Using the NEOS Server with filter

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

The nonlinear programming 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. The commands file must not contain the model or data commands. The model and data files are renamed internally by NEOS.

The commands file may include AMPL commands and option settings for filter. To specify solver options, add

option filter_options "OPTIONS";
where OPTIONS is a list of one or more of the filter options. See the FILTER Directives for AMPL.

Enter the location of the AMPL model (local file)
Model File:

Enter the location of the AMPL data file (local file)
Data File:

Enter the location of the AMPL commands file (local file)
Commands File:


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:

By submitting a job, you have accepted the Terms of Use
Please do not click the 'Submit to NEOS' button more than once.

Submit comments and questions Terms of Use