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Support System object in Simulink For Each subsystem


flag = supportsMultipleInstanceImpl(obj)


flag = supportsMultipleInstanceImpl(obj) specifies whether the System object™ can be used in a Simulink® For Each subsystem via the MATLAB System block. To enable For Each support, you must include the supportsMultipleInstanceImpl in your class definition file and have it return true. Do not enable For Each support if your System object allocates exclusive resources that may conflict with other System objects, such as allocating file handles, memory by address, or hardware resources.

Run-Time Details

During Simulink model compilation and propagation, the MATLAB System block calls the supportsMultipleInstance method, which then calls the supportsMultipleInstanceImpl method to determine For Each support.

Method Authoring Tips

  • You must set Access = protected for this method.

  • You cannot modify any properties in this method.

Input Arguments

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System object handle used to access properties, states, and methods specific to the object. If your supportsMultipleInstanceImpl method does not use the object, you can replace this input with ~.

Output Arguments

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Boolean value indicating whether the System object can be used in a For Each subsystem. The default value, if you do not include the supportsMultipleInstanceImpl method, is false.


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Specify in your class definition file that the System object can be used in a Simulink For Each subsystem.

methods (Access = protected)
   function flag = supportsMultipleInstanceImpl(obj)
       flag = true;

Version History

Introduced in R2014b