The NEOS Server offers ASA (Adaptative Simulated Annealing) for the solution
of simple bound constrained optimization problems in AMPL format.
Additionally other constraint types may also be added. For an unfeasible
point the user defined objective function will return an invalid state,
therefore a TOO_MANY_INVALID_STATES error may occur for problems where it is
difficult to obtain feasible points.
ASA makes no use of derivative information of the objective function (so
modest problem size should be submitted).
For further information about ASA interface to AMPL,
For further information about
ASA contact the ASA author.
Examples of models in AMPL format can be found in the
The following is a list of options for ASA that the user may set via the
AMPL input files. For example, option asa_options "maxf=1000";
option asa_options "maxf=1000";
The user must submit a model in AMPL
format. Examples are provided in
section of the AMPL website.
The problem must be specified in a model file. A data file and commands
files may also be provided. If the commands file is specified, it must
contain the AMPL solve command; however, it must not contain
the model or data commands. The model and data
files are renamed internally by NEOS.
The commands file may include option settings for the solver. To specify
solver options, add
option asa_options 'OPTIONS';