Counting Events

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When to Count Events How to Count Events Example of Collecting and Storing Input Data in a Vector

When to Count Events

Count events when you want to keep track of explicit or implicit events in your chart.

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How to Count Events

You can count occurrences of explicit and implicit events using the temporalCount operator. For information about the syntax of this operator, see Operators for Event-Based Temporal Logic.

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Example of Collecting and Storing Input Data in a Vector

The following model collects and stores input data in a vector during chart simulation:

The chart contains two states and one MATLAB function:

Stage 1: Observation of Input Data

The chart awakens and remains in the Observe state, until the input data u is positive. Then, the transition to the state Collect_Data occurs.

Stage 2: Storage of Input Data

After the state Collect_Data becomes active, the value of the input data u is assigned to the first element of the vector y. While this state is active, each subsequent value of u is assigned to successive elements of y using the temporalCount operator.

Stage 3: Display of Data Stored in the Vector

After 10 ticks, the data collection process ends, and the transition to the state Observe occurs. Just before the state Collect_Data becomes inactive, a function call to status displays the vector data at the MATLAB prompt.

For more information about ticks in a Stateflow chart, see Using Implicit Events.

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Using Implicit Events

Best Practices for Using Events in Stateflow Charts

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