Difference between revisions of "Time index"

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.

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.

@@ Line 3: / Line 3: @@
-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>.
+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 <code>Time</code>, select '''Edit Time''' from the '''Definition''' menu to open the '''Object''' window for <code>Time</code>.
+To edit the definition of [[Time]], select '''Edit Time''' from the [[Definition menu]] to open the [[Object window]] for '''Time'''.
-<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.
+[[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.
-[[File:Chapter17_1.png]]
+:[[File:Chapter17_1.png]]
-<code>Time</code> becomes the index for the array that results from the [[Dynamic]]() function.
+[[Time]] becomes the index for the array that results from the [[Dynamic]] function.
-<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 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>
-<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 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.
 </Tip>
 ==See Also==
-* [[Dynamic]]()
+* [[Arrays and indexes]]
+* [[Time]]
+* [[Dynamic]]
+* [[Tutorial: Dynamic system model]]
+* [[Date and time values]]
 <footer>Dynamic Simulation / {{PAGENAME}} / Dynamic function</footer>