Originally posted by: qtbgo

Hi, How to express something  like the following in OPL:

forall( i in 1..n)

   sum(j in M[i]) x[j] >=1;

Where M[i] is a set dependent on i.

Thanks in advance.

Hi,

what you wrote is correct and let me give you a full example that works fine:

int n=10;
 {int} M[i in 1..n]={1,i};
 
 
 dvar int x[1..10] in 1..10;
 
 subject to
 {
 forall( i in 1..n)

   sum(j in M[i]) x[j] >=1;
   
 } 

regards