Decision Optimization

Decision Optimization

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  • 1.  Issue with set defination

    Posted Sat March 27, 2021 11:01 AM
    Hi,

    I am working on the scheduling problem which at one of the constraints there is an if-then statement in the outer loop something like the following: 
    (for i in I)
(for p in P)
(for t in T)
(for s in S):
p<= i and
if p==i then t!=s
​

    I am trying to write this as follows:

    subject to {
  	forall(i in I,p in P,s in S,t in T: p<=i) 
  	  co1:	
		LHS <= RHS;
  	forall(i in I,p in P,s in S,t in T: t!=s) 
  	if(p==i) {	
  	  co2:
		LHS <= RHS;;
        }
}

    But, I am not sure it is being what I am looking for. I was wondering if, how can I define this?

    Best regards
    Abbas

    ------------------------------
    Abbas Omidi
    ------------------------------


    #DecisionOptimization


  • 2.  RE: Issue with set defination

    Posted Sun March 28, 2021 01:21 PM
    Hi

    forall(i in I,p in P,s in S,t in T)
co1:	
if ((p<=i-1) || ((p==i) && (t!=s)))
LHS <= RHS;
​


    should work
    regards



    ------------------------------
    [Alex] [Fleischer]
    [EMEA CPLEX Optimization Technical Sales]
    [IBM]
    ------------------------------

    Original Message


  • 3.  RE: Issue with set defination

    Posted Mon March 29, 2021 07:36 AM
    Dear Alex,

    Thank you so much for your time and support.

    Best regards
    Abbas

    ------------------------------
    Abbas Omidi
    ------------------------------

    Original Message


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