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. | + | Dynamic simulation time periods are specified in the system variable <code>Time</code>. To perform dynamic simulation, you must provide a definition for <code>Time</code>. |
| − | To edit the definition of Time, select Edit Time from the Definition menu to open the Object window for Time. | + | To edit the definition of <code>Time</code>, select '''Edit Time''' from the '''Definition''' menu to open the '''Object''' window for <code>Time</code>. |
| − | 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. | + | <code>Time</code> is defined by default as a list of three numbers 0, 1, and 2. You might want to define <code>Time</code> as a list of years, as in the following example. |
[[File:Chapter17_1.png]] | [[File:Chapter17_1.png]] | ||
| − | Time becomes the index for the array that results from the Dynamic() function. | + | <code>Time</code> becomes the index for the array that results from the <code>Dynamic()</code> function. |
| − | <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(). | + | <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]]()'''. |
</Tip> | </Tip> | ||
| − | <tip title= "Tip"> | + | <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> | ||
==See Also== | ==See Also== | ||
| − | *[[Dynamic]]() | + | * [[Dynamic]]() |
<footer>Dynamic Simulation / {{PAGENAME}} / Dynamic function</footer> | <footer>Dynamic Simulation / {{PAGENAME}} / Dynamic function</footer> | ||
Revision as of 06:56, 18 December 2015
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.
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()
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