Originally posted by: AndyHam

Hi IBM,

I have a question about CP-MIP interlinking. I am trying to generate an allocation decision by MIP and feed it to CP for the sequencing job.

• MIP model has a decision variable of x[j][r][m]
• CP has an interval variable of itvMach (tuple qual) // tuple tpQual has three members: j, r, and m.

My question is how to convert MIP's x[j][r][m] so that I can force the presence of corresponding itvMach of CP. 

The highlighted area has an error, but I hope it shows what I am trying to do.

  for(var j=1;j<=nj;j++)

    for(var r=1;r<=nr;r++)
      for(var m=1;m<=nm;m++)
           if(j2m.job==j && j2m.mch==m && j2m.ret==r && opl1.x[j][r][m]==1) opl2.add(presenceOf(itvMach[j,r,m])==true);
 

main {

  var data = new IloOplDataSource("Litho.dat");
  var source1 = new IloOplModelSource("Litho_MIP.mod");
  var cplex = new IloCplex();
  var def1 = new IloOplModelDefinition(source1);
  
  var source2 = new IloOplModelSource("Litho_CP.mod");
  var cp = new IloCP();
  var def2 = new IloOplModelDefinition(source2);
  
  var opl1 = new IloOplModel(def1,cplex);
  opl1.addDataSource(data);
  var opl2 = new IloOplModel(def2,cp);
  opl2.addDataSource(data);
  opl1.generate();
  opl2.generate();

  cplex.tilim=10;
  cplex.solve();
  writeln("cplex objective = ",cplex.getObjValue());
 
  cp.param.timelimit=10;
  cp.param.SearchType=24;
  for(var j=1;j<=nj;j++)
  for(var r=1;r<=nr;r++)
    for(var m=1;m<=nm;m++)
           if(j2m.job==j && j2m.mch==m && j2m.ret==r && opl1.x[j][r][m]==1) opl2.add(presenceOf(itvMach[j,r,m])==true);
 
  cp.solve();
 }

Regards,

Andy 

Hi,

in the Class IloOplCPSolution, you could use setPresence and setPresent

Regards