Create System Objects

Write a MATLAB^®class that creates and defines a new System object™

You can define your own System object by customizing the implementation methods. Use graphical tools to explore the comprehensive API for creating System objects. For example, you can insert methods to initialize, run, reset, and terminate System objects. For an introduction to defining a System object, seeDefine Basic System Objects.

Methods

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Initialize, Run, Reset

`setupImpl`	InitializeSystem object
`stepImpl`	System output and state update equations
`resetImpl`	ResetSystem objectstates
`releaseImpl`	Release resources

Properties and States

`infoImpl`	Information aboutSystem object
`isDoneImpl`	End-of-data flag
`isInactivePropertyImpl`	Status of inactive property
`isTunablePropertyDataTypeMutableImpl`	Set whether tunable properties can change data type
`isDiscreteStateSpecificationMutableImpl`	Control whether discrete states can change data type
`processTunedPropertiesImpl`	Action when tunable properties change
`setProperties`	Set property values using name-value pairs when creatingSystem object
`validatePropertiesImpl`	Validate property values ofSystem object
`getPropertyGroupsImpl`	Property groups for System object display

Input and Output

`getNumInputsImpl`	Number of inputs to the System object
`getNumOutputsImpl`	Number of outputs fromSystem object
`getNumInputs`	Number of inputs required to call theSystem object
`getNumOutputs`	Number of outputs from calling theSystem object
`isInputComplexityMutableImpl`	Set whether System object input complexity can change
`isInputDataTypeMutableImpl`	Set whether System object input data type can change
`isInputSizeMutableImpl`	Set whether System object input size can change
`nargin`	Number of input arguments forSystem object
`nargout`	Number of output arguments forSystem object
`processInputSpecificationChangeImpl`	Perform actions when input size, complexity, or data type change
`validateInputsImpl`	Validate inputs toSystem object

Load and Save

`loadObjectImpl`	LoadSystem objectfrom MAT file
`saveObjectImpl`	SaveSystem objectin MAT file

Update Syntax

sysobjupdate Update customSystem objectto latest syntax

Classes

`matlab.System`	Base class for System objects
`matlab.system.mixin.FiniteSource`	Finite source mixin class

Topics

Getting Started Writing System Objects

Define Basic System Objects
Create a basic System object with thestepImplmethod.

Property Attributes

Define Property Attributes
Specify property attributes to limit the type, visibility, and value of properties.
- Validate Property and Input Values
- Set Property Values at Construction Time
- Hide Inactive Properties
- Limit Property Values to Finite List
- Process Tuned Properties
- 使用全局变量在系统对象

Input and Output

Change the Number of Inputs
This example shows how to set the number of inputs for a System object™ with and without usinggetNumInputsImpl.
Define Composite System Objects
Define System objects that include other System objects as properties.
Handle Input Specification Changes
Implement methods to restrict when System object input complexity, data type, or size can change or implement a method to react when input specifications change.

Performance and Efficiency

Tips for Defining System Objects
Tips to speed up slow System objects.
Detailed Call Sequence
当你调用序列显示的方法u run a System object.
Define Finite Source Objects
This example shows how to define a System object that performs a specific number of steps or specific number of reads from a file.
Save and Load System Object
Use a MATLAB structure to save and load System object properties and state.

Related Information

Customize System Objects for Simulink(Simulink)
System Objects in MATLAB Code Generation(MATLAB Coder)

Featured Examples

Create Moving Average System object

Walks through how to create a System object that computes a moving average.

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Create New System Objects for File Input and Output

Define new System objects for file input and output.

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Create Composite System object

Create a System object composed of other System objects.

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