Difference between revisions of "Time index"

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Dynamic simulation time periods are specified in the system variable [[Time]]. To perform dynamic simulation, you must provide a [[definition]] for '''Time'''.
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To edit the definition of [[Time]], select '''Edit Time''' from the [[Definition menu]] to open the [[Object window]] for '''Time'''.
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[[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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:[[File:Chapter17_1.png]]
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[[Time]] becomes the index for the array that results from the [[Dynamic]] function.
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<tip tilte="Tip"> 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]]().
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</Tip>
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<tip title= "Tip">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.
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</Tip>
  
 
==See Also==
 
==See Also==
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* [[Arrays and indexes]]
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* [[Time]]
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* [[Dynamic]]
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* [[Tutorial: Dynamic system model]]
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* [[Date and time values]]
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<footer>Dynamic Simulation / {{PAGENAME}} / Dynamic function</footer>
 
<footer>Dynamic Simulation / {{PAGENAME}} / Dynamic function</footer>

Latest revision as of 23:24, 22 August 2016

Analytica User GuideDynamic SimulationTime 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.

Chapter17 1.png

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

Tip
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().
Tip
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


Dynamic SimulationTime indexDynamic function
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