Extracting an index from a variable

Question

t = time indexM = vehicle indexI = supply nodeJ = intermodal nodeI have a variable with (t,M,I,J) index which determines the number of units delivered to a specific node. However, I want to determine the time of delivery of each set of units as a separate variable. Thus, it’s like extracting t from the variables (t,M,I,J). How do I approach this?Thaank you!

gabiservidone · Accepted Answer

Hey @ccfcuento, depends a little on what is your final objective and how you have set the variable domain for these indexes.

If t is unique for M,I,J, then you can use something like:

ep_uniqueT(i1, i2, i3) := first(it | p_complete(i1, i2, i3, it));

If not, you can use:

ep_multipleT(i1, i2, i3, it) := it $ p_complete(i1, i2, i3, it);

Attached the section I created this example, you can add it to your model by importing it: https://how-to.aimms.com/Articles/145/145-import-export-section.html#importing-a-section

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