Originally posted by: SatishA

Hi All,

I am trying to solve a job shop scheduling problem with the following sequence variable and no overlap variable with changeover time.

int taskType[k in PO_TASK_AR_SEQ_ALT_COMB]= k.po;
int taskType2[k in Machine_Shutdown_Details_Comb]= 999;

tuple triplet { int p1; int p2; int time; }
{triplet} tt[m in all_machines] = 
  { <t1.po,t2.po,SeqDepSetup[<m,t1.po,t2.po>].time> | t1,t2 in PO_TASK_AR_SEQ_ALT_COMB:
    <m,t1.po,t2.po> in Setup_Comb && m==ProdTime[t1].machineindex  && m==ProdTime[t2].machineindex} ;
    
dvar sequence all_sequences[m in all_machines] 
        in append(all(k in PO_TASK_AR_SEQ_ALT_COMB:m==ProdTime[k].machineindex) all_tasks[k],
                          all(k1 in Machine_Shutdown_Details_Comb:k1.machineindex==m)all_shutdowns[k1])
        types append(all(k in PO_TASK_AR_SEQ_ALT_COMB:m==ProdTime[k].machineindex) taskType[k],
                 all(k1 in Machine_Shutdown_Details_Comb:k1.machineindex==m) taskType2[k1]);
                 
forall(m in all_machines)
    noOverlap(all_sequences[m],tt[m],1);

After solving the problem, I would like to find out between which two tasks, changeover is applied. For that I need to know the sequence variable details like on each machine, task position, next task/previous task. When I printed the following, I could see the details. But how can I access each of it and export this data just like we do for any other integer variable ?

execute{
  for(m in all_machines)
   writeln("all_sequences: ", all_sequences[m]) };

Please help me out.

Thanks,

Satish

Hi,

in documentation for Class IloIntervalSequenceVar

you may see

using CP;

range R = 1..3;

dvar interval tia[i in R] size i;
dvar sequence seq in tia;

subject to {
  noOverlap(seq);

  before(seq, tia[2], tia[3]);
  prev(seq, tia[1], tia[3]);
}

execute {
  writeln(seq);
  writeln(seq.first() );
  writeln(seq.next(seq.first() ) );
  writeln(seq.last() );

  writeln("loop");
  var s=seq.first();
  for(var i in R)
  {
   writeln(s);
   s=seq.next(s) ;
  }
  writeln(s);
}

regards