Simple Sets and Indexing - AMPL | STREAMLINED MODELING …

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5_______________________________________ ________________________________________ _________________Simple sets and IndexingThe next four chapters of this book are a comprehensive presentation ofAMPL s facil-ities for linear programming. The organization is by language features, rather than bymodel types as in the four preceding tutorial chapters. Since the basic features ofAMPLtend to be closely interrelated, we do not attempt to explain any one feature in , we assume at the outset a basic knowledge ofAMPLsuch as Chapters 1 through begin with sets , the most fundamental components of anAMPLmodel. Almostall of the parameters, variables, and constraints in a typical model are indexed over sets ,and many expressions contain operations (usually summations) over sets .

74. SIMPLE SETS AND INDEXING CHAPTER 5. entity — such as raw materials, products, factories or cities. Often the strings are chosen to have recognizable meanings (coils, FISH, New_York), but they could just as well

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