Originally posted by: Moit1910

Hi,

 

I'm quite new to CPLEX and the OPL programming language as well as to programming in general.

I came across a problem, for witch I can't find a solution within this forum nor elsewhere in the internet.

 

The problem is:

How can I put multiple filters onto a set within a conditional loop?

 

What I want to say is that I have a constraint that shall be declared ∀ i ∈ N\{0}, j ∈ N\{0}, i ≠ j.

 

I tried the following, giving me the syntax error "unexpected (identifier), expecting ',' or ')':

range N =0..n

[...]

forall (i in N : i>=1)
          forall (j in N : j>= 1 AND j!=i )

 

I also tried the following, giving me the syntax error "unexpected ':', expecting ',' or ')':

range N =0..n

[...]

forall (i in N : i>=1)
          forall (j in N : j>= 1 : j!=i )

 

Can anybody please tell me how I can put multiple filters onto a set within such a conditional forall-loop?

 

Thank you in advance.

#DecisionOptimization
#OPLusingCPLEXOptimizer

Hi,

let me give you an example:

int n=3;
 range N =0..n;

dvar int x[N] in N;

subject to
{
forall (i in N : i>=1)
          forall (j in N : (j>= 1) && (j!=i) )  x[i]>=x[j];
}  ;

regards

 

https://twitter.com/AlexFleischer1

 

#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: Moit1910

Thank you.

That did it. ;-)

#DecisionOptimization
#OPLusingCPLEXOptimizer