Noncumulative Counting of Entities
This example shows how to count entities, which arrive to an Entity Terminator block, in a noncumulative way by resetting the counter at each time instant.
To open the example, see
Model for Noncumulative Entity Count.
Add two Entity Generator blocks, an Entity Input Switch block, an Entity Terminator block, and a Simulink Function block from the SimEvents® library to a new model. For more information, see Simulink Function.
Connect the blocks as shown in the diagram.
Double-click the Entity Generator1 block. In the Entity generation tab, set the Period to
In the model,
2entities arrive to Entity Terminator block at time
1entity arrives at time
Double-click the function signature on the Simulink Function block and enter
Double-click the Simulink Function block. Add a Digital Clock block from the Simulink > Sources library. Set the Sample time parameter to
-1for inherited sample time.
Add a MATLAB Function block. Double-click it and enter this code.Save the file (optional).
function y = fcn(curtime) % Define count for counting and prevtime for previous time stamp persistent count prevtime; % Check if prevtime is empty and initiate the count if isempty(prevtime) prevtime = curtime; count = 0; end % Increase count by 1 for equal time stamps. if isequal(curtime, prevtime) count = count + 1; % Reset count to 1 if two consequitive time stamps are not identical else prevtime = curtime; count = 1; end % Output count for visualization y = count; end
Connect the output of the MATLAB Function block to a Simulink® Scope block.
In the parent model, double-click the Entity Terminator block. In the Entry action field of the Event actions tab, enter this code.
Simulate the model and open the Scope block in the Simulink Function block.
Change the plotting settings of the Scope block by right-clicking the plot and selecting Style. Select
no linefor the Line and
circlefor the Marker parameters.
Observe that the block illustrates the noncumulative entity count for the entities arriving the Entity Terminator block. The block also illustrates the instantaneous entity arrivals at each time.
To count the number of events that occur instantaneously, use
nonCumCount() in any Event actions.
- Count Simultaneous Departures from a Server
- Generate Entities When Events Occur
- Specify Intergeneration Times for Entities
- Generate Multiple Entities at Time Zero