MINOS is an established choice for both linear and nonlinear optimization problems. It incorporates proven methods for large-scale sparse nonlinear constraints, and its methods are especially effective for nonlinear objectives subject to linear and near-linear constraints.

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How to use it

ampl: option solver minos; # change the solver
ampl: option minos_options 'option1=value1 option2=value2'; # specify options
ampl: solve; # solve the problem


Full list of solver options: