Originally posted by: Valentin_J

Hi everyone,

I try to program a DARP model based on Cordeau and Laporte one, a copy actually.. :)

Datas or note really effective yet, i want the model runnel running first.

but first of all, I've got an issue on the last constraint and I don't know what is wrong with it :/

It says that cplex can't extract it..

More over I don't know how to print the solution (when it will work :D).

thx in advance, best regards.

Originally posted by: Petr Vilím

Hello,

I get the following error on your files:

ERROR[GENERATE_102] at 79:2-81:28 mod.mod: Index out of bound for array "t#22": 42.

And indeed, array t is defined as:

float t[N][N]=...;              //Timde needed from node i to node j

And then it is accessed this way:

        forall (i in N)                         //Setting and checking ride time
          forall (k in K)
            t[i][n+i]<=r[i][k]<=L;

So although i is in range N, expression i+n isn't (unless n=0).

Regarding printing the solution, you can use OPL Script and function writeln. I recommend to have a look on some examples opl/examples/opl/*/*.mod, many of them are using writeln.

Finally, you posted your question on CP forum. If you want to solve your problem using CP Optimizer you need "using CP;" at the beginning of the file. Otherwise it will be solved by CPLEX.

Best regards, Petr

Originally posted by: Valentin_J

Thank !

So, yes I manage to solve this issue by changing the data of "t".

And in fact it was forall (i in P) not i in N that why it was out of bound. 

I will check for example then if I have question about it I will come here :)

Oh ok, by the way is it CPLEX or CP to solve this kind of model ?

Thx you a lot.

Valentin. 

Originally posted by: Petr Vilím

You're welcome!

By default cplex solver is used unless there is "use CP;" at the beginning of the file.

In your case cplex is the only option because there are floating-point decision variables (CP has only integer decision variables and floating-point expressions). On the other hand CP has more powerful language. To use its power you would need to remodel the problem (if integer decision variables would be enough).

Petr

Originally posted by: Valentin_J

Thank again Petr,

Unfortunatly, it will be hard to remodel it, in one hand because I've got float for the time of traveling and for distances, in a over hand I don't even know if the model for a Dial a Ride Problem can be integer decision maker.

By the way do you know what is Error 5002 ? it says that one of my variable 'q1' is not convex. what does it mean ?

Have a good day,

Valentin.

Originally posted by: Petr Vilím

Hello Valentin,

I'm sorry, I don't know about Error 5002. Please ask in CPLEX forum here:

https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000002059

Petr

Originally posted by: Valentin_J

It's ok thank a lot for your help.

here is the link of my new topic for the convex error if someone is getting the same issue so he could fix it.

 https://www.ibm.com/developerworks/community/forums/html/topic?id=cc4ab098-f529-4212-aa05-63fc6cb8e019

Bye have a nice day,

Valentin.