Time index

Dynamic simulation time periods are specified in the system variable Time. To perform dynamic simulation, you must provide a definition for Time.

To edit the definition of Time, select Edit Time from the Definition menu to open the Object window for Time.

Time is defined by default as a list of three numbers 0, 1, and 2. You might want to define Time as a list of years, as in the following example.

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Time becomes the index for the array that results from the Dynamic function.

A model can have only one definition Time — that is, one set of time periods for Dynamic functions. Any number of variables in the model can be defined using Dynamic().
A variation, Dynamic[T](), can be used to represent recurrences over indexes other than Time, but placing the index name in square brackets. This provides a way to express secondary recurrences if you’ve already used your Time index for sometime else. The dynamic concepts are introduced thoroughly in this chapter using Time, but if you have a loop using a different index, just substitute your other index for Time in what follows.

See Also


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