temporalCount - Number of events, chart executions, or time since state became active - MATLAB (original) (raw)

Main Content

Number of events, chart executions, or time since state became active

Syntax

Description

temporalCount(`E`) returns the number of occurrences of the event E since the associated state became active.

example

temporalCount(`tick`) returns the number of times that the chart has woken up since the associated state became active.

The implicit event tick is not supported when a Stateflow® chart in a Simulink® model has input events.

example

temporalCount(`time_unit`) returns the length of time that has elapsed since the associated state became active. Specifytime_unit as seconds (sec), milliseconds (msec), or microseconds (usec).

example

Note

Standalone Stateflow charts in MATLAB® support using temporalCount only as an absolute-time temporal logic operator.

Examples

expand all

Access successive elements of the array M each time that the chart processes a broadcast of the event E.

In charts in a Simulink model, enter:

on E:
   y = M(temporalCount(E));

Using temporalCount as an event-based temporal logic operator is not supported in standalone charts in MATLAB.

Store the value of the input data u in successive elements of the array M.

In charts in a Simulink model, enter:

en,du: M(temporalCount(tick)+1) = u;

Using temporalCount as an event-based temporal logic operator is not supported in standalone charts in MATLAB.

Store the number of milliseconds since the state became active.

en,du: y = temporalCount(msec);

Tips

• You can use quotation marks to enclose the keywords 'tick','sec', 'msec', and 'usec'. For example, temporalCount('tick') is equivalent totemporalCount(tick).
• The Stateflow chart resets the counter used by the temporalCount operator each time the associated state reactivates.
• The timing for absolute-time temporal logic operators depends on the type of Stateflow chart:
  • Charts in a Simulink model define temporal logic in terms of simulation time.
  • Standalone charts in MATLAB define temporal logic in terms of wall-clock time.
    The difference in timing can affect the behavior of a chart. For example, suppose that this chart is executing the entry action of stateA.
    
  • In a Simulink model, the function call to f executes in a single time step and does not contribute to the simulation time. After calling the functionf, the chart assigns a value of zero toy.
  • In a standalone chart, the function call to f can take several seconds of wall-clock time to complete. After calling the functionf, the chart assigns the nonzero time that has elapsed since state A became active to y.

Version History

Introduced in R2008a