Originally posted by: SystemAdmin

[T.B. said:]

Dear all,

My OPL is an old verson --OPL3.7.  When I ran the code, OPL indicated that the line in red in the code had some mistake, and the error

message is in the  following:

[color=blue][u]E:\Study\ILog\linebalance.mod(28) : semantic error: identifier 'k' has not been declared[/u][/color]

range jobs 1..11;
range stations 1..4;
int priority[jobs,jobs]=[
  [0,1,0,0,0,0,0,0,0,0,0],
  [0,0,1,0,0,0,0,0,0,0,0],
  [0,0,0,0,0,1,1,0,0,0,0],
  [0,0,0,0,1,0,0,0,0,0,0],
  [0,0,0,0,0,0,0,1,1,0,0],
  [0,0,0,0,0,0,0,0,0,1,0],
  [0,0,0,0,0,0,0,0,0,1,0],
  [0,0,0,0,0,0,0,0,0,1,0],
  [0,0,0,0,0,0,0,0,0,1,0],
  [0,0,0,0,0,0,0,0,0,0,1],
  [0,0,0,0,0,0,0,0,0,0,0]];
 
int time[jobs]=[45,11,9,50,15,12,12,12,12,8,9];

var int+ arrange[jobs,stations] in 0..1;
var int+ cycletime in 0..5000;

minimize cycletime
subject to{
  forall(i in jobs)
    sum(j in stations) arrange[i,j] =1;
    forall(j in stations)
    sum(i in jobs) time[i]*arrange[i,j] <=cycletime; <br />    forall(i in jobs, j in jobs: priority[i,j]=1)
      [color=red]sum(k in staions) k*arrange[j,k]-k*arrange[i,k] >=0[/color];
};

Really appriciate your kind advice!

T.B.
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

[T.B. said:]

Dear,

Please note that "the line in red in the code" should be this one:

[color=red]"sum(k in staions) k*arrange[j,k]-k*arrange[i,k] >=0;"[/color]

T.B.
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

[alain.chabrier said:]

I desintalled OPL3.7 from my machine, but I could find something looking at it in OPL6

It seems a parenthesis precedence issue.

try :

sum(k in stations) (k*arrange[j,k]-k*arrange[i,k]) >=0;

Alain
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

[UDOPS said:]

Also note in your original code that you misspelled "stations".
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

[alain.chabrier said:]

[quote author=UDOPS link=topic=572.msg1731#msg1731 date=1222113718]
Also note in your original code that you misspelled "stations".


Indeed. I don't know for OPL3.7, butr OPL6 did give an precise warning on this.

Alain
#DecisionOptimization
#OPLusingCPLEXOptimizer