Originally posted by: Y9AX_Pooyan_Kazemian

Hi,

I describe My problem with an example. Suppose we want to write the following in CPLEX:

Sum(i from 5 to 10) sum(j form 1 to i) x_ij <= 100

The problematic part is the second summation that goes from 1 to i.

In CPLEX I write:

forall (i in 1..10 , j in 1..i) const: x[i][j]<=100;

It returns the following error:

“Constraint labeling not supported for dimensions with variable size, use named constraints instead.”

There should be a way to write the summation when it’s dependent to the preceding summation. Any help is appreciated?

Thanks,
Pooyan
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