GAMS/ODHCPLEX is a solver from
Optimization Direct Inc. that
implements a set of heuristic methods (named ODHeuristics) for finding
feasible solutions to Mixed Integer Programming (MIP and MIQCP) models
that uses IBM CPLEX as its underlying solver engine. It is designed
for large-scale models which a MIP solver would find intractable:
either by it being unable to find feasible solutions at all or; more
usually, by being unable to find feasible solutions of adequate
quality in the time available to its user.
Details on ODHCPLEX can be found on the GAMS/ODHCPLEX website.
The user must submit a model in GAMS
format to solve an optimization problem. For security purposes, the model
submitted must adhere to the following conventions:
If you are unfamiliar with GAMS, the
GAMS Documentation includes a
GAMS Tutorial and
Examples of models in GAMS format can be found in the
GAMS model library.
By default, the NEOS Server limits the amount of output generated in the
listing file by turning off the symbol and unique element list, symbol cross
references, and restricting the rows and columns listed to zero. This
behavior can be changed by specifying the appropriate options in the model
file. See the
documentation on GAMS output
for further information.
You may optionally submit an options file if you wish to override the
default parameter settings for the solver. Currently, the NEOS Server can
only use optfile=1 with GAMS input. Therefore, any model that
specifies a different options file will not work as intended.
More details can be found on the
<modelname>.optfile = 1 ;
optfile = 1