MATLAB: Do I get the error message ‘There is no ‹PropertyName› property in the ‹ClassName› class.’

MATLAB

Why do I get the following error message :

 There is no ‹PropertyName› property in the ‹ClassName› class.

Best Answer

Explanation:

You are attempting to set a property of a graphics object, but that property is not a property of that object. Alternatively, that name does not correspond to a property of that class.

Common causes:

You are attempting to set a property of a graphics object, such as FontName or Callback for a figure, but figure objects have neither a FontName nor a Callback property. If you know that the object has that property, there may be a typographical error in the name of the property.

Solution:

Verify that the name in the SET or GET statement on the line listed in the error message is spelled correctly and that the property you are attempting to access with the SET or GET function is a valid property for that type of Handle Graphics object using the Handle Graphics Object Properties browser.

Example demonstrating this error:

InvalidObjectProperty.m

Related Solutions

MATLAB: How to set object property to Abstract class

To specify an Abstract class as a property for a MATLAB class, you must also specify a default value for the property which is a class that is derived from the abstract class you specified.

The code below demonstrates how the code you provided might be modified to accomplish this workflow.

classdef demoClass
  properties
    TestProperty matlab.mixin.Heterogeneous = rootClass
  end
  methods
    function obj = demoClass
      % constructor that does not affect the property
    end
  end
end
classdef rootClass < matlab.mixin.Heterogeneous
  methods
    function obj = rootClass
    end     
  end
end

And now you should be able to instantiate an instance of "demoClass":

>> demoClass
ans = 
  demoClass with properties
    TestProperty: [1×1 rootClass]

MATLAB: Property Name

set() cannot be used to change numbers that are of any of the built-in numeric types (e.g., uint8, double, logical), and there is no UserData property for any of those numeric classes.

Also, for future reference, those numeric classes cannot have Properties, and no dynamic properties can be set for them.

Best Answer

Related Solutions

MATLAB: How to set object property to Abstract class

MATLAB: Property Name

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