如何创建一个没有边界的整数数组？

Question

I need an array for the integer variables of an optimization problem. When I use

IloNumVarArray x = CreateNumVarArray (env, 100, "x");

I have x1 to x100 but they are not integers.

Changed the code to

IloIntVarArray x = CreateIntVarArray (env, 100, "x");

and I tried to add an objective function using these variables with

IloObjective obj = IloMinimize(env, IloSum(x));
model.add(obj);

The objective function is fine, all my variables are integers too, but now i have bounds like

x1=0
x2=0
...
x100=0

Any help on how to get those integer variables in an array without the bounds?

Answer 1

but which status do you get for cplex? Unbounded?

Let me replicate your model in OPL:

range r=1..100;

dvar int x[r];

minimize sum(i in r) x[i];
subject to
{
  
}

execute
{
  writeln(x[1].LB);
  writeln(cplex.status);
}

which gives

-2147483647
2

The status 2 means unbounded. And you see the Lower Bound of x[1] is very low So what you did is fine and does not set any bounds