Originally posted by: BabakArh

I code the exact example of, IBM tutorial in C#. the objective value, and start time of interval is wrong. I think the lib dont work for me. it return 20 for obj and 0 for all interval start

 the problem minimize MAKE SPAN for scheduling problem.

here is my code

/*
 * Created by SharpDevelop.
 * User: bbka2
 * Date: 05/18/2016
 * Time: 8:54 PM
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;
using System.IO;
using ILOG.CP;
using ILOG.Concert;


namespace test_here
{
    /// <summary>
    /// Description of CMAX.
    /// </summary>
    public class CMAX
    {
        public IIntExpr makespan;
        public IIntervalVar[] act_;
        public IIntExpr[] end;
        public CP scheduler;
        public IObjective obj;
        public int n_;
        public CMAX()
        {
            initial();
            disp();
        }
        public void initial()
        {
            n_=5;
            scheduler=new CP();
            act_=new IIntervalVar[n_];
            makespan=scheduler.Constant(0,"MakeSpan");
            for (int i = 0; i < n_; i++) {
                act_[i]=scheduler.IntervalVar(4,"act"+i.ToString());
                act_[i].EndMax=30;
                act_[i].EndMin=0;
                act_[i].StartMax=30;
                act_[i].StartMin=0;
                act_[i].LengthMax=4;
                act_[i].LengthMin=4;
                Console.WriteLine(act_[i].ToString());
                makespan=scheduler.Sum(makespan,scheduler.EndOf(act_[i]));
                Console.WriteLine(makespan.ToString());
            }
            scheduler.NoOverlap(act_);
            scheduler.AddMinimize(makespan);
            scheduler.SetParameter(CP.IntParam.SearchType,CP.ParameterValues.DepthFirst);
        }
        public void disp()
        {
            if (scheduler.Solve()) {
                //scheduler.Solve();
                Console.WriteLine("this is th obj {0}",scheduler.ObjValue);
                for (int i = 0; i < n_; i++) {
                    Console.WriteLine("the act {0}, has start {1}",i,scheduler.GetStart(act_[i]));
                }
            }
        }
    }
}

Hi,

since you do not use OPL.

I think you should post your question at https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000002066&ps=25

regards

Originally posted by: BabakArh

it is make span for one machine 5 job, all job has 4 as a time. the start time should be 0,4,8,12,16 but it returns 0 to all
 

Hi,

So let me give you the OPL version:

using CP;

dvar interval act[1..5] in 0..30 size 4;

dexpr int makespan=max(i in 1..5) endOf(act[i]);

minimize makespan;
subject to
{
noOverlap(act);

}

execute
{
writeln("makespan=",makespan);
writeln("act=",act);
}

and that gives

makespan=20
act= [<1 0 4 4> <1 4 8 4> <1 12 16 4> <1 16 20 4>
     <1 8 12 4>]

regards

Originally posted by: BabakArh

i think I wrote sum(p_time) for abject, it could give me 4+8+12+16+20

and for the start time i get 0 for all.

is it wrong what I code which gave me 0 for start time?

Originally posted by: BabakArh

https://www.ibm.com/developerworks/community/forums/html/topic?id=e3d0473d-a6b6-454e-9b17-7236e9e9ea32#repliesPg=0