Hi,

I got this question many times so let me write how to use a decision variable in a ternary operator in an OPL CPLEX expression.

With CPO we can write

using CP;

dvar  int x in -10..10;

dexpr int y=(x>=0)?2:3;

subject to
{
  y==3;
}

execute
{
  writeln("x=",x);
}

We can read the definition of y as if (x>=0 then y is 2 else y is 3

But with CPLEX that does not work.We get an error, decision variable x not allowed

But we can write

dvar  int x in -10..10;

dexpr int y=(x>=0)*2+(x<=-1)*3;

subject to
{
  y==3;
}

execute
{
  writeln("x=",x);
}

regards

NB: Many how to at https://www.linkedin.com/pulse/how-opl-alex-fleischer/