Originally posted by: SatishKumarA

Hi All,

I have a set of resources {1,2,3,4} each one belongs to certain type called Resource_Type {1,2}. While defining a variable say X, I would like to declare it as

dvar int+ X[Resource_Type] in Resources[Resource_Type];

whereas data should be like

Resources[1] = {1,3};
Resources[2] = {2,4};

which indicates Resources 1,3 are of Resource_Type and 2,4 are of Resource_Type 2.

Currently, the domain for variable X is all Resources independent of its type. But I would like to reduce the domain and so would like to assign the domain based on Resource_Type.

How can I implement this in OPL?

Hi,

what I would do

{int} Resources[1..2]=[{1,3},{2,4}];

dvar int+ X[Resource_Type] in 1..4;

and then

subject to

{

forall(i in Resource-Type) X[i] in Resources[i];

}

regards

Originally posted by: SatishKumarA

Thanks for the reply Alex.

I am getting the resource set from the database. I am trying to generalize the grouping of resources from above code as follows.

{int} Resources[j in ResourceTypes]= all(k in ResourceSet:Parameter_Resource_Type[k]==j) k;

It is showing an error saying

Cannot use type int[] for {int}

Help me out.

Thanks,

Satish

what about

{int} Resources[j in ResourceTypes]= {k | k in ResourceSet:Parameter_Resource_Type[k]==j};

regards

Originally posted by: SatishKumarA

Thanks Alex. Its working.