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Crear System objects

Escriba una clase de MATLAB^® que cree y defina un nuevo System object™

Para poder definir un System object propio, se deben personalizar los métodos de implementación. Use herramientas gráficas para explorar la extensa API y crear System objects. Por ejemplo, se pueden insertar métodos para inicializar, ejecutar, restablecer y terminar System objects. Para ver una introducción a la definición de un System object, consulte Define Basic System Objects.

Métodos

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Métodos de creación (protegidos)

Especificación de entrada

`getNumInputsImpl`	Number of inputs to the System object
`isInputDataTypeMutableImpl`	Set whether System object input data type can change
`isInputSizeMutableImpl`	Set whether System object input size can change
`isInputComplexityMutableImpl`	Set whether System object input complexity can change
`isInputDirectFeedthroughImpl`	Direct feedthrough status of input
`getInputDimensionConstraintImpl`	Define input dimension constraints for dataflow subsystems

Especificación de salida

`getNumOutputsImpl`	Number of outputs from System object
`getOutputDataTypeImpl`	Data types of output ports
`getOutputSizeImpl`	Sizes of output ports
`isOutputComplexImpl`	Complexity of output ports
`isOutputFixedSizeImpl`	Fixed- or variable-size output ports
`getOutputDimensionConstraintImpl`	Define output dimension constraints for dataflow subsystems

Especificación de estado

`getDiscreteStateSpecificationImpl`	Discrete state size, data type, and complexity
`isDiscreteStateSpecificationMutableImpl`	Control whether discrete states can change data type
`getDiscreteStateImpl`	Discrete state property values

Especificación de tiempo de muestreo

`getSampleTimeImpl`	Specify sample time type, offset time, and sample time
`allowModelReferenceDiscreteSampleTimeInheritanceImpl`	Model reference sample time inheritance status for discrete sample times

Especificación de interfaz

`getGlobalNamesImpl`	Global variable names for MATLAB System block
`getInterfaceImpl` (Simulink)	Set System object as message or data
`isTunablePropertyDataTypeMutableImpl`	Set whether tunable properties can change data type
`isDoneImpl`	End-of-data flag
`getSimulateUsingImpl`	Specify value for Simulate using parameter
`getSimulinkFunctionNamesImpl`	Register Simulink function names used in your System object
`showFiSettingsImpl`	Fixed point data type tab visibility for System objects
`supportsMultipleInstanceImpl`	Support System object in Simulink For Each subsystem
`getImpulseResponseLengthImpl`	Define length of input effects for dataflow subsystems
`supports1DVectorsImpl`	Enable MATLAB System block to use 1-D signals for input and output

Cuadro de diálogo y apariencia de bloque

`getPropertyGroupsImpl`	Property groups for System object display
`showSimulateUsingImpl`	Visibility of Simulate using parameter
`getIconImpl`	Name to display as block icon
`getHeaderImpl`	Header for System object display
`getInputNamesImpl`	Names of MATLAB System block input ports
`getOutputNamesImpl`	Names of MATLAB System block output ports
`isInactivePropertyImpl`	Status of inactive property

Métodos de simulación

`setupImpl`	Initialize System object
`stepImpl`	System output and state update equations
`resetImpl`	Reset System object states
`releaseImpl`	Release resources
`processTunedPropertiesImpl`	Action when tunable properties change
`validatePropertiesImpl`	Validate property values of System object
`processInputSpecificationChangeImpl`	Perform actions when input size, complexity, or data type change
`validateInputsImpl`	Validate inputs to System object
`updateImpl`	Update object states based on inputs

Clonar, guardar y cargar

`loadObjectImpl`	Load System object from MAT file
`saveObjectImpl`	Save System object in MAT file

Ayuda

infoImpl Information about System object

Funciones de consulta (protegidas)

Funciones para implementar métodos de creación

`setProperties`	Set property values using name-value pairs when creating System object
`propagatedInputComplexity`	Complexity of input during Simulink propagation
`propagatedInputDataType`	Data type of input during Simulink propagation
`propagatedInputFixedSize`	Fixed-size status of input during Simulink propagation
`propagatedInputSize`	Size of input during Simulink propagation
`createSampleTime`	Create sample time specification object
`getSampleTime`	Query sample time
`getCurrentTime`	Current simulation time in MATLAB System block
`setNumTicksUntilNextHit` (Simulink)	Set the number of ticks in Simulink sample time
`displayScalarObject`	Display format for scalar objects
`getHeader`	Build customized display header text
`getFooter`	Build and return display footer text

Métodos de implementación (públicos)

Métodos para implementar System objects

`nargin`	Number of input arguments for System object
`nargout`	Number of output arguments for System object
`getNumInputs`	Number of inputs required to call the System object
`getNumOutputs`	Number of outputs from calling the System object
`setup`	One-time set up tasks for System objects
`reset`	Reset internal states of System object
`step`	Ejecutar el algoritmo System object
`release`	Release resources and allow changes to System object property values and input characteristics
`clone`	Create duplicate System object
`isDone`	End-of-data status
`isLocked`	Determine if System object is in use

Funciones

sysobjupdate Update custom System object to latest syntax

Clases

`matlab.System`	Base class for System objects
`matlab.system.mixin.FiniteSource`	Finite source mixin class
`matlab.system.display.Action`	Custom button
`matlab.system.display.Icon`	Custom icon image
`matlab.system.display.Header`	Header for System objects properties
`matlab.system.display.SectionGroup`	Section group for System objects
`matlab.system.display.Section`	Property group section for System objects

Temas

Introducción a la escritura de System objects

Define Basic System Objects

Create a basic System object with the stepImpl method.

Atributos de propiedad

Define Property Attributes

Specify property attributes to limit the type, visibility, and value of properties.

Entrada y salida

Change the Number of Inputs
This example shows how to set the number of inputs for a System object™ with and without using getNumInputsImpl.
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.

Rendimiento y eficiencia

Tips for Defining System Objects
Tips to speed up slow System objects.
Detailed Call Sequence
Call sequence showing the order of methods when you 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.