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.
expressions that involve only sets and parameters, however. Section 7.4 describes how logical expressions are used to test the validity of data, either directly in a parameter dec-laration, or separately in acheckstatement. Section 7.5 introduces features for defining new parameters through arithmetic expressions in previously declared ...
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