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MATLAB Discrete-Event System

MATLAB discrete-event system

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  • MATLAB Discrete-Event System block

Libraries:
SimEvents

Description

The MATLAB Discrete-Event System block allows you to create and author custom discrete-event systems. With this block, you can author an event-driven entity-flow system using MATLAB®, and use it in your Simulink® model. For more information about implementing matlab.DiscreteEventSystem class with MATLAB Discrete-Event System block, see Create Custom Blocks Using MATLAB Discrete-Event System Block.

Below, there are six examples to help you learn how to create custom blocks using the MATLAB Discrete-Event System block.

  1. Delay Entities with a Custom Entity Storage Block

  2. Create a Custom Entity Storage Block with Iteration Event

  3. Custom Entity Storage Block with Multiple Timer Events

  4. Custom Entity Generator Block with Signal Input and Signal Output

  5. Build a Custom Block with Multiple Storages

  6. Create a Custom Resource Acquirer Block

Examples

Selection Server - Select Specific Entities from Server

Selection Server - Select Specific Entities from Server

Use the MATLAB Discrete Event System block to write a custom N-Server from which specific entities can be selected using a key lookup. Passengers enter from the IN port of the block and are stored in the block until a message arrives at the KEY port carrying a lookup key. Upon receiving this message, the system schedules an "Iterate" event during which it can visit every entity stored in it and output the one that matches the key.

Server with Pause/Continue

Server with Pause/Continue

Use a MATLAB Discrete Event System block to model a single server that can pause service. The input port IN receives entities to be served. Additionally, the system may receive sporadic pause commands on port PauseCmd. If the message received on the PauseCmd port carries data=1, the system pauses. The system reschedules service for the current entity when it receives a continue message on this port, i.e. a message that carries data=0.

Parameters

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Specify the full name of the user-defined discrete-event System object class without the file extension. This entry is case sensitive. The class name must exist on the MATLAB path.

You can specify a discrete-event System object name in one of these ways:

  • Enter the name in the text box.

  • Click the list arrow attached to the text box. If valid System objects exist in the current folder, the names appear in the list. Select a System object from this list.

  • Browse to a folder that contains a valid discrete-event System object. If the folder is not on your MATLAB path, the software prompts you to add it.

If you need to create a discrete-event System object, you can create one from a template by clicking New.

After you save the SimEvents® System object, the name appears in the System object name text box.

Use the full name of the user-defined discrete-event System object class name. The block does not accept a MATLAB variable that you have assigned to a discrete-event System object class name.

Programmatic Use

Block Parameter: System
Type: character vector
Values: '<Enter System Class Name>' | character vector
Default: '<Enter System Class Name>'

Click this button to create a SimEvents System object from a template.

Select one of these options.

  • Basic

    Starts MATLAB Editor and displays a template for a simple discrete-event System object using the fewest System object methods.

After you save the SimEvents System object, you can enter the name in the System object name text box.

Specify the simulation mode as Code generation or Interpreted execution.

  • Interpreted execution

    This mode simulates the System object based on the interpreted MATLAB language with debuggers enabled.

  • Code generation

    This code generation mode reduces simulation time of SimEvents models. On the first model run, the MATLAB Discrete-Event System block simulates and generates code using only MATLAB functions supported for code generation. If the System object code and the block parameters do not change, subsequent model runs do not regenerate the code. MATLAB Discrete-Event System blocks also support code reuse for models that have multiple MATLAB Discrete-Event System blocks using the same System object source file. For more information, see Generate Code for MATLAB Discrete-Event System Blocks.

Programmatic Use

Block Parameter: SimulateUsing
Type: character vector
Values: 'Code generation' | Interpreted execution
Default: 'Code generation'

Version History

Introduced in R2016a

See Also

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