Originally posted by: Dogdog

Hi all.

I want to know how to access a sequence variable in post processing.
This is an excerpt from my code:

int nbJobs = ...;
range Jobs = 1..nbJobs;
 
int duration[Jobs] = ...;
 
dvar interval task[j in Jobs] size duration[j];
dvar interval opttask[j in Jobs][m in Machines] optional size duration[j];
dvar sequence schedule[m in Machines] in all(j in Jobs) opttask[j][m];
 
execute {
  writeln(schedule[1]);
};

In the last execute box, I want to access the "schedule" variable. I tried to search in the ILOG CPLEX Help, but in there there are only two methods for accessing sequence variable, i.e. ".first()" and ".last()". I want to access the "position" and "declaredPosition" in the sequence variable.

Thanks before for helping.
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Originally posted by: GuangFeng

This is the example shown in the documentation of IloIntervalSequenceVar

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); 
}

Is it sufficient for your purpose?
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Originally posted by: Dogdog

Actually, I want to access the "position" and "declaredPosition" values for a particular element in the given sequence.
For example, something like: sequence[1].declaredPosition = ....
Is it possible? Thanks.
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#OPLusingCPLEXOptimizer

Originally posted by: GuangFeng

Can you explain what you mean by "position" and "declaredPosition"? What are the differences between "position" and "declaredPosition"?
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Originally posted by: Dogdog

I actually don't know much about them. What I understood is, "Position" and "declaredPosition" are values in the sequence type variable. I think of them just like "Start" and "End" in interval type variable, which can be accessed by methods namely, "xxxx.start" and "xxxx.end".
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Originally posted by: GuangFeng

My bad. Now I know where you read them, but I don't have an answer now.
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Originally posted by: Dogdog

Anyway, thanks you for answering.
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