Originally posted by: optimiz

Hello everyone,

I am trying to input the initial values of my IloNumArray type of data. In ILOG Cplex C++, how can I set the value of an "IloNumArray" to negative infinity?

Thanks

Have you tried using -IloInfinity or -std::numeric_limits<IloNum>::infinity() (the latter requires inclusion of <limits>)?

Originally posted by: optimiz

I actually tried IloInfinity but it doesn't seem to be working. The way I define it:

IloNumArray data (env, 100);

I tried:

for(i=0; i < 100; i++)

{

data[i] = -IloInfinity;

}

It doesn't work. I am not sure about how to get the second form that you suggest. Could you give me an example of how you would set the values to -IloInifinity?

Thanks

I would write the code exactly like you did. So what do you mean by "it does not work"? Does it

• not compile
• crash at runtime
• show strange behavior at runtime (what happens, what do you expected instead)?

Originally posted by: optimiz

So, when I run the code, I get the following error:

Error  1650: Number not representable in exponential notation

What is the function that throws this exception?

It looks like you are using infinity in a place where this is not allowed. What exactly are you using this value for, i.e., what are you doing with this IloNumArray that contains infinite values?

Originally posted by: optimiz

So, data is used as a left hand side coefficient in the model. For example, 

model.add(data[i]*x[i] + data2[i]*y[i] >=0.2)kind of constraints (assuming this is in a for loop, and data2 is IloNumArray with real numbers and y is IloNumVarArray)

Using infinity as coefficient in a linear expression that is used in a constraint is not supported. And it makes no sense, I think. What is a term like 'infinity * y[i]' supposed to mean in a linear constraint?