Originally posted by: hacimehmet

Hi,

I want to write the following code block with java. Can anyone help me?

Especially part of (stationNumber[i]==j)). I cannot write this true or false part.

In this code block, tasktime is an integer array, stastionNumber is a decision variable, stationtime is a decision variable. models, stations and tasks are ranges.

forall(m in models,j in stations){

sum (i in tasks) (taskTime[m][i] * (stationNumber[i]==j)) == stationtime[m][j];

}

Thank you in advance.

Originally posted by: ChrisBr

Hello,

You might try:

for (int m = 0; m < models; m++)
  for (int j = 0; j < stations; j++) {
    IloIntExpr expr = cp.intExpr();
    for (int i = 0; i < tasks; i++)
      expr = cp.sum(expr, cp.prod(taskTime[m][i], cp.eq(stationNumber[i],j)));
    cp.add(cp.eq(expr, stationtime[m][j]));
  }

I hope this helps,

Chris.

Originally posted by: hacimehmet

Thanks for your help Chris. This is my first code trying to write in java. I cannot understand some errors.

 In this part of code, it didn't give an error first time. But when i run the code it gave the following error. How can i correct the code.

java.lang.RuntimeException: internal error: bad cast

at ilog.concert.cppimpl.IloConcertUtils.ToCppIloIntExpr(IloConcertUtils.java:274)

at ilog.cp.IloCP.eq(IloCP.java:3292)

at example01.Karma_modelli_MHDP.main(Karma_modelli_MHDP.java:55)

55. row is as follows:

expr = cp.sum(expr, cp.prod(tasktime[m][i], cp.eq(stationnumber[i],j)));

Originally posted by: hacimehmet

I solved the problem, thanks again for your help Chris.

I made a mistake at defining variables. Now, It is OK.