moving elements in a set to the end

Question

Hi,

Let’s say I have a set consisting of 5 elements such that: Set1 = {‘A’,‘B’,‘C’,‘D’,‘E’}.

How can I move some elements to the end of the set. For example:

Set1 = {‘A’, ‘D’,’E’,’B’,’C’}

Thanks!

gabiservidone · Accepted Answer

Below is a step-by-step example with some code to implement!

Define the original set:

Set Set1 {
    Index : i;
    Members : {'A', 'B', 'C', 'D', 'E'};
}

Create a parameter to define the sorting order:

Parameter p_NewOrder {
    IndexDomain : i;
    Definition  : Data { 'A': 1, 'D': 2, 'E': 3, 'B': 4, 'C': 5 };
}

Define a new set with the OrderBy attribute:

Set OrderedSet1 {
    SubsetOf : Set1;
    OrderBy  : p_NewOrder(i);
}

By executing this code, OrderedSet1 will be automatically sorted based on the values defined in p_NewOrder.

gabiservidone · Answer

InAIMMS, this transformation can be achieved by creating a new set where the order of elements is specified dynamically. A structured approach is as follows:Define the Original Set: Create the initial set (e.g.,Set1) and populate it with the predefined elements:{'A', 'B', 'C', 'D', 'E'}.Create a Parameter: Define a parameter to represent the new order. Assign indices to rearrange the elements. For instance, define a parameterp_NewOrder(i)whereirepresents the elements ofSet1. Assign values corresponding to the target order:{'A': 1, 'D': 2, 'E': 3, 'B': 4, 'C': 5}.Sort Dynamically: Utilize the indexing capabilities to sort the set dynamically based on the parameter values. AIMMS allows reorganization of sets using such logical parameters.

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