Notes on indefinite sets in parameter statements

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Parameter statements do not always have to have definitive set assignments. If one enters an * in an index position, then anything at all can be placed in that position. In above example, I use this allowing the inclusion of both existing sets and other items in these positions. For example, in the first position of the incoming parameter I am using both the set destination and the element text "total".

incoming(destinaton,"shipments","in cases","from",source)

incoming("total","shipments","in cases","from",source)

•	Note one should not use an * in declarations in place of set names when inputting table or parameter data. Only use it for output data and then infrequently.

•	This is discussed more fully in the Sets chapter.

Use of named sets in the specifications allows GAMS to check to make sure you're not misspelling anything.