count

Chart executions during which condition is valid

Syntax

count(C)

Description

count(C) returns a double value equivalent to the number of chart executions (tick) after the conditional expression, C, becomes true. The count operator is reset if the conditional expression becomes false. If the count operator is used within a state, it is reset when the state that contains it is entered. If the count operator is used on a transition, it is reset when the source state for that transition is entered.

The value for count depends on the step size. Changing the solver or step size for your Simulink^® model affects the result of Stateflow^® charts that include the count operator.

To ensure that your Stateflow chart simulates without error, do not use count with these objects:

• Continuous time charts

• Graphical, MATLAB^®, or Simulink functions

• Simulink based states

• Transitions that can be reached from multiple states

• Default transitions

Examples

Absolute-Time Based State Action

Store the number of chart executions since the variable data has been greater than 5.

exit:
   x = count(data>5)

Absolute-Time Based Transition

Transition out of the state when the variable data has been greater than or equal to 2 for longer than 5 chart executions.

[count(data >= 2) > 5]