Transcription of Parameters and Expressions - AMPL
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Parameters and Expressions - AMPL
7_____Parameters and ExpressionsA large optimization model invariably uses many numerical values. As we haveexplained before, only a concise symbolic description of these values need appear in anAMPL model, while the explicit data values are given in separate data statements, to bedescribed in Chapter single named numerical value is called aparameter. Although someparameters are defined as individual scalar values, most occur in vectors or matrices orother collections of numerical values indexed over sets. We will thus loosely refer to anindexed collection of Parameters as a parameter when the meaning is clear. To beginthis chapter, Section describes the rules for declaring Parameters and for referring tothem in and other numerical values are the building blocks of the Expressions thatmake up a model s objective and constraints.
Parameters and other numerical values are the building blocks of the expressions that make up a model’s objective and constraints. Sections 7.2 and 7.3 describe arithmetic expressions, which have a numerical value, and logical expressions, which evaluate to true or false. Along with the standard unary and binary operators of conventional alge-
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