Use Multiple Indices for a Set¶
This article was originally posted to the AIMMS Tech Blog.
You can use different indices to refer to the elements of the same set.
Suppose we have a set,
Cities, and a parameter,
Distance. We want to define
Distance over 2 dimensions (
to) for the same set,
If you didn’t know that AIMMS can handle multiple indices for a set, you might create two new subsets
CitiesTo, containing all elements of the set
Cities, and each with its own index.
Luckily, you can just assign multiple indices to one set.
When you create a new set, you can directly add multiple indices to it by typing all of them in the index attribute field, separated by commas (e.g.
city, cityFrom, cityTo).
After the initial assignment of indices, you can’t edit in the
index attribute of the set anymore. It will be grayed out when you open the attribute window.
Instead, use the
index attribute wizard by clicking the magic wand icon just left of the input field. The wizard appears, as shown below.
Alternatively, you can manually add an
index identifier to your model tree for each index you want to add. For these
index identifiers, you will have to set the
range attribute to the corresponding set as shown below:
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Last Updated: June, 2019