GAMS — The Solver Manuals - Available Software

CPLEX 11 187
-1 Turns Feasible Pump heuristic off
0 Automatic
1 Apply the feasibility pump heuristic with an emphasis on finding a feasible solution
2 Apply the feasibility pump heuristic with an emphasis on finding a feasible solution with a good
objective value
fraccand (integer)
Limits the number of candidate variables for generating Gomory fractional cuts.
(default = 200)
fraccuts (integer)
Determines whether or not Gomory fractional cuts should be generated during optimization.
(default = 0)
-1 Do not generate Gomory fractional cuts
0 Determined automatically
1 Generate Gomory fractional cuts moderately
2 Generate Gomory fractional cuts aggressively
fracpass (integer)
Sets the upper limit on the number of passes that will be performed when generating Gomory fractional
cuts on a mixed integer model. Ignored if parameter fraccuts is set to a nonzero value.
(default = 0)
0 0 Automatically determined
>0 Maximum passes to perform
gubcovers (integer)
Determines whether or not GUB (Generalized Upper Bound) cover cuts should be generated during optimization.
The default of 0 indicates that the attempt to generate GUB cuts should continue only if it seems
to be helping.
(default = 0)
-1 Do not generate GUB cover cuts
0 Determined automatically
1 Generate GUB cover cuts moderately
2 Generate GUB cover cuts aggressively
heurfreq (integer)
This option specifies how often to apply the node heuristic. Setting to a positive number applies the heuristic
at the requested node interval.
(default = 0)
iis (integer)
-1 Do not use the node heuristic
0 Determined automatically
Find an IIS (Irreducably Inconsistent Set of constraints) and write an IIS report to the GAMS solution
listing if the model is found to be infeasible. Legal option values are yes or no.
(default = 0)