CPLEX 11

CPLEX 11 375 Sifting6 Concurrent dual, barrier, and primalquality (integer)Write solution quality statistics to the listing file. If set to yes, the statistics appear after the Solve Summaryand before the Solution Listing.(default = 0)readflt (string)The GAMS/Cplex solution pool options cover the basic use of diversity and range filters for producingmultiple solutions. If you need multiple filters, weights on diversity filters or other advanced uses of solutionpool filters, you could produce a Cplex filter file with your favorite editor or the GAMS Put Facility andread this into GAMS/Cplex using this option.reduce (integer)Determines whether primal reductions, dual reductions, or both, are performed during preprocessing. It isoccasionally advisable to do only one or the other when diagnosing infeasible or unbounded models.(default = 3)reinv (integer)0 No primal or dual reductions1 Only primal reductions2 Only dual reductions3 Both primal and dual reductionsRefactorization Frequency. This option determines the number of iterations between refactorizations of thebasis matrix. The default should be optimal for most problems. Cplex’s performance is relatively insensitiveto changes in refactorization frequency. Only for extremely large, difficult problems should reducing thenumber of iterations between refactorizations be considered. Any non-negative integer value is valid.(default = 0, in which case it is determined automatically)relaxfixedinfeas (integer)Sometimes the solution of the fixed problem of a MIP does not solve to optimality due to small (dual)infeasibilities. The default behavior of the GAMS/Cplex link is to return the primal solution values only.If the option is set to 1, the small infeasibilities are ignored and a full solution including the dual values arereported back to GAMS.(default = 0)0 Off1 Onrelaxpreind (integer)This option will cause the Cplex presolve to be invoked for the initial relaxation of a mixed integer program(according to the other presolve option settings). Sometimes, additional reductions can be made beyondany MIP presolve reductions that may already have been done.(default = -1)-1 Automatic0 do not presolve initial relaxation1 use presolve on initial relaxationrelobjdif (real)The relative version of the objdif option. Ignored if objdif is non-zero.(default = 0)