CPLEX 11

CPLEX 11 39rinsheur (integer)Cplex implements a heuristic known a Relaxation Induced Neighborhood Search (RINS) for MIP andMIQCP problems. RINS explores a neighborhood of the current incumbent to try to find a new, improvedincumbent. It formulates the neighborhood exploration as a MIP, a subproblem known as the subMIP, andtruncates the subMIP solution by limiting the number of nodes explored in the search tree.Parameter rinsheur controls how often RINS is invoked. A value of 100, for example, means that RINS isinvoked every hundredth node in the tree.(default = 0)-1 Disable RINS0 Automaticrngrestart (string)Write ranging information, in GAMS readable format, to the file named. Options objrng and rhsrng areused to specify which GAMS variables or equations are included.(default = ranging information is printed to the listing file)scaind (integer)This option influences the scaling of the problem matrix.(default = 0)-1 No scaling0 Standard scaling. An equilibration scaling method is implemented which is generally very effective.1 Modified, more aggressive scaling method. This method can produce improvements on some problems.This scaling should be used if the problem is observed to have difficulty staying feasible during thesolution process.siftalg (integer)Sets the algorithm to be used for solving sifting subproblems.(default = 0)0 Automatic1 Primal simplex2 Dual simplex3 Network simplex4 Barriersiftdisplay (integer)Determines the amount of sifting progress information to be displayed.(default = 1)0 No display1 Display major iterations2 Display LP subproblem informationsiftitlim (integer)Sets the maximum number of sifting iterations that may be performed if convergence to optimality has notbeen reached.(default = large)