Difference between revisions of "Time index"
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[[File:Chapter17_1.png]]
 
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<code>Time</code> becomes the index for the array that results from the <code>Dynamic()</code> function.
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<code>Time</code> 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 <code>Time</code> — 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 tilte="Tip"> A model can have only one definition <code>Time</code> — 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 title= "Tip">A variation, '''Dynamic[T]()''', can be used to represent recurrences over indexes other than <code>Time</code>, but placing the index name in square brackets. This provides a way to express secondary recurrences if you’ve already used your <code>Time</code> index for sometime else. The dynamic concepts are introduced thoroughly in this chapter using <code>Time</code>, but if you have a loop using a different index, just substitute your other index for <code>Time</code> in what follows.
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<tip title= "Tip">A variation, [[Dynamic]][T](), can be used to represent recurrences over indexes other than <code>Time</code>, but placing the index name in square brackets. This provides a way to express secondary recurrences if you’ve already used your <code>Time</code> index for sometime else. The dynamic concepts are introduced thoroughly in this chapter using <code>Time</code>, but if you have a loop using a different index, just substitute your other index for <code>Time</code> in what follows.
 
</Tip>
 
</Tip>
  

Revision as of 19:54, 4 January 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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