Originally posted by: AmirB.

HI,

I have a model in OPL and use main script.

 Is it possible to change objective function and use only one .mod file? in the other word,

How could I change objective function in the main script, (not change one or two variable's coefficient ).

I want to remove the unnecessary parts from the objective function and set new variables.

For example I have " minimization  z+2*x" then I want changing it to " minimization  y+3*x+2*z-12".

Can you help me?

Best Regards

Hi,

have you had a look at setObjCoef

https://www.ibm.com/developerworks/community/forums/html/topic?id=51f87068-85ca-4a8c-9931-b516bdd69f1e ?

regards

Originally posted by: AmirB.

Hi Dear Alex,

Thanks a lot.

Best regards

Originally posted by: AmirB.

Hi,

I have two questions in my code.

1. when I uncomment  " if(testopl.x >= -0.5)" create a Error "No solution exist" . what is problem?can you help me to remove this error?

2. I have two type post Process in my code (exe1 and exe2). at piece of code I want to run "exe1" and not "exe2" by postProcess() function. How can I do?

Best Regards

dvar float+ x;
dvar float+ y;

minimize x+y;
subject to
{
cons1:
   x+y <= 1;
}

execute exe1{
writeln("x= " , x , " y = " , y);
}

execute  exe2{
writeln("x= " , x , " y = " , y);
}

main
{
  
  var modeltest = thisOplModel.modelDefinition
  var testopl = new IloOplModel(modeltest,cplex);
  
  testopl.generate();
  if(cplex.solve())
  {
     writeln("the opt = ",cplex.getObjValue());
     writeln("post prossing means = ");
     testopl.postProcess();
  }
  
   //*********************************************
   //**** change objective function coeffience
   if(testopl.y >= -0.5)
       cplex.setObjCoef(testopl.y,-1);
 //  if(testopl.x >= -0.5)   ????????????????????????????
      cplex.setObjCoef(testopl.x,-1);

  cplex.solve();
  writeln("the new opt after change coefince of constrain = ",cplex.getObjValue()); 
     testopl.postProcess();
}

Hi

1) I would write

var tx=testopl.x.solutionValue;
   var ty=testopl.y.solutionValue;;
   
   if(ty >= -0.5)
       cplex.setObjCoef(testopl.y,-1);
 if(tx >= -0.5)   
      cplex.setObjCoef(testopl.x,-1);

2) Can you write the different set of instructions in the main ?

Otherwise a workaround could be to write a status in a file and then read this status to know whether 1 or 2 should be run, not very elegant.

Regards

Originally posted by: AmirB.

Hi Alex,

Thank a lot.

Second suggest was better. When I run one suggest in real model give error.

Best Regards