Implement Blocks with System Objects

Use a System object™ in Simulink^® using MATLAB System blocks

MATLAB System block uses a System object to implement MATLAB^® algorithms in Simulink. Before you begin using a MATLAB System block, you must have a System object to associate with a block. A System object is a special kind of MATLAB class and they are designed specifically for the implementation and simulation of dynamic systems. For information on implementing and authoring system objects, see Create System Objects.

Blocks

MATLAB System

Include System object in model

Examples and How To

Implement a MATLAB System Block
Implement a block and assign a System object to it.
Change Blocks Implemented with System Objects
Implement a block with another System object.
Specify Sample Time for MATLAB System Block
The sample time of a block is a parameter that indicates when the block produces an output, and eventually updates its internal state.
Call Simulink Functions from MATLAB System Block
Learn to call a Simulink function from a MATLAB System block.
Change Block Icon and Port Labels
Change the icon appearance of your block.
Add and Implement Propagation Methods
To define output specifications, use propagation methods.
Use System Objects in Feedback Loops
Process nondirect feedthrough data through the System object.
Share Data with Other Blocks
Share data between MATLAB System and other blocks using the global keyword and the Data Store Memory block or Simulink.Signal object.
Call Python Function Using MATLAB Function and MATLAB System Block
This example shows how to call a Python® function in Simulink® that sorts random numbers using a Python® sorting function and two different blocks: the MATLAB Function block and MATLAB System block.

Concepts

MATLAB System Block
Implement your own algorithms using System objects.
Mapping System Object Code to MATLAB System Block Dialog Box
The System object source code controls the appearance of the block dialog box.
Simulation Modes
You can use a MATLAB System block in Simulink models for simulation via interpreted execution or code generation.
Simulink Engine Interaction with System Object Methods
Follow a process view of the order in which the MATLAB System block invokes System object methods within the context of the Simulink engine.
Nonvirtual Buses and MATLAB System Block
Use nonvirtual buses as input and output signals.
Share Data with Other Blocks
Share data between MATLAB System and other blocks using the global keyword and the Data Store Memory block or Simulink.Signal object.
Considerations for Using System Objects in Simulink
Consider these guidelines when working with variable-size signals, tunable parameters, and For Each subsystems.

Troubleshooting

Troubleshoot System Objects in Simulink

Use these guidelines to troubleshoot System objects in Simulink.

Related Information

System Objects

Featured Examples

Implement a Simple Algorithm

Use a simple System object™ in Simulink® with the MATLAB System block.

Open Model

Customize MATLAB System Block Dialog

Customize the block dialog for a MATLAB System block.

Open Model

Break Algebraic Loops

Create a MATLAB System block that can break an algebraic loop in the model.

Open Model

Customize MATLAB System Block Appearance

Customize the appearance of the MATLAB System block.

Open Model

Specify Output Characteristics of MATLAB System Block

Specify output size, data type and complexity of a MATLAB System block.

Open Model

Integrate Python GPS Text Message Parsing Algorithms in Simulink

Parse text messages in NMEA GPS format using Simulink® string blocks and Python®. NMEA sentences are used for communication between marine devices, and the model in the example decodes RMB and RMC sentences in NMEA. RMB is the sentence for the recommended navigation data for GPS. RMC is the sentence for the recommended minimum data for GPS sentences.

Open Model

Convert Moving Target MATLAB Code to a Simulink Model

Convert MATLAB® algorithms into a Simulink® model using a moving target example. The conversion allows you to build models that contain MATLAB and Simulink components. This example uses MATLAB code for target creation and deletion then shows you how to convert that functionality into Simulink.

Open Live Script