Originally posted by: Rohit_Sar

Hi,

So I'm writing an optimization code for Maximal Set Partitioning Problem in CPLEX Studio in OPlIDE. My code is as follows:

 execute PARAMS
{

cplex.nodefileind = 3;
cplex.workmem = 15360; 
//cplex.preind = 0; 
cplex.epgap = 0.001; 

}

//Setting Constants and Bounds//

int A_MAX = 29;//Number of Nodes//
int N_MAX = 29179791;//Number of Sub-Graphs//
int T = 10;//Threshold//
int M = 10000000;//Big M//

//Ranging Indices//

range A = 1..A_MAX;//Set of Nodes//
range N = 1..N_MAX;//Set of Sub-Graphs//

//Creating Parameters//

float D[A] = [10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10];//Demand in Node i//
float S[A] = [10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10];//Supply in Node i//
float X[N][A] = ...;//1 if Sub-Graph j contains Node i, 0 o/w //

//Decision Variables//
dvar boolean Y[N];

maximize
   sum(j in N) Y[j];
        
        subject to
        {
        
         forall(i in A)
          {
          Constraint_1:
          sum(j in N)
            X[j][i]*Y[j] == 1;
         }            
         
         forall(j in N) 
          {
          Constraint_2:
          sum(i in A) (X[j][i])*(D[i]) - sum(i in A) X[j][i]*S[i] <= T + M*(1 - Y[j]); 
        }
                                 
         forall(j in N)
          {
          Constraint_3:
          sum(i in A) (X[j][i])*(D[i]) - sum(i in A)(X[j][i])*(S[i]) >= -T - M*(1 - Y[j]); 
        }                    
             
      }         
             
    execute{

  var ofile = new IloOplOutputFile("Results_Test.csv");
 
  ofile.writeln("Optimal objective value="+cplex.getObjValue());
  ofile.writeln("Optimal_variable_values");
  
  for(var j in thisOplModel.N) 
  {
  
  ofile.write("Y["+j+"]= "+thisOplModel.Y[j]+" ");
  ofile.writeln (" ");      
  
  }
  
  ofile.close();
  
}  
 

Array X holes binary ( 0 or 1) values and is a 29million X 29 matrix.

                
While running this warning is displayed:
Array "X" partially initialized, expecting 29179791 items, found 4295775. 

Please help.                 
            
            
          
          
          
          
          
          
   
        

Hi,

let me give you a small example to show you the meaning of that error.

int X[1..2]=[1];

execute
{
writeln(X);
}

subject to
{
}

gives this warning

Array "X" partially initialized, expecting 2 items, found 1.   

whereas no wrning with

int X[1..2]=[1,2];

execute
{
writeln(X);
}

subject to
{
}

regards