CPLEX 11

CPLEX 11 38repairtries (integer)This parameter lets you indicate to Cplex whether and how many times it should try to repair an infeasibleMIP start that you supplied. The parameter has no effect if the MIP start you supplied is feasible. It hasno effect if no MIP start was supplied.(default = 0)-1 None: do not try to repair0 Automatic>0 Maximum tries to performrepeatpresolve (integer)This integer parameter tells Cplex whether to re-apply presolve, with or without cuts, to a MIP model afterprocessing at the root is otherwise complete.(default = -1)-1 Automaticrerun (string)0 Turn off represolve1 Represolve without cuts2 Represolve with cuts3 Represolve with cuts and allow new root cutsThe Cplex presolve can sometimes diagnose a problem as being infeasible or unbounded. When this happens,GAMS/Cplex can, in order to get better diagnostic information, rerun the problem with presolve turned off.The GAMS solution listing will then mark variables and equations as infeasible or unbounded according tothe final solution returned by the simplex algorithm. The iis option can be used to get even more diagnosticinformation. The rerun option controls this behavior. Valid values are auto, yes, no and nono. The valueof auto is equivalent to no if names are successfully loaded into Cplex and option iis is set to no. In thatcase the Cplex messages from presolve help identify the cause of infeasibility or unboundedness in terms ofGAMS variable and equation names. If names are not successfully loaded, rerun defaults to yes. Loadingof GAMS names into Cplex is controlled by option names. The value of nono only affects MIP models forwhich Cplex finds a feasible solution in the branch-and-bound tree but the fixed problem turns out to beinfeasible. In this case the value nono also disables the rerun without presolve, while the value of no stilltries this run. Feasible integer solution but an infeasible fixed problem happens in few cases and mostly withbadly scaled models. If you experience this try more aggressive scaling (scaind) or tightening the integerfeasibility tolerance epint. If the fixed model is infeasible only the primal solution is returned to GAMS.You can recognize this inside GAMS by checking the marginal of the objective defining constraint which isalways nonzero.(default = yes)auto Automaticyes Rerun infeasible models with presolve turned offno Do not rerun infeasible modelsnono Do not rerun infeasible fixed MIP modelsrhsrng (string)Calculate sensitivity ranges for the specified GAMS equations. Unlike most options, rhsrng can be repeatedmultiple times in the options file. Sensitivity range information will be produced for each GAMS equationnamed. Specifying all will cause range information to be produced for all equations. Range informationwill be printed to the beginning of the solution listing in the GAMS listing file unless option rngrestart isspecified.(default = no right-hand-side ranging is done)