MATLAB: “findobj” for user defined class

classfindobjoop

Does anyone has an idea whether is there a way to fetch all instances of certain class from a up-level instance of different classes?

For example, instance A1 of Class A and instance B1 of Class B both contain instances of Class C. Is there a way to call something like "findobj" to get all instances of Class C from A1 and B1?

Thanks.

Best Answer

While @Steve Lord has answered the question "why you shouldn't do this," I'll go ahead and try to answer how you can do this, and possibly shoot yourself in the foot - due to inconsistent state.

To do this, you want to use a factory design pattern and keep a log of all instantiated objects in a singleton.

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MATLAB: How to override inherited methods

You can't do what you asked. If you could, you could relax the property setting validation to the point where your subClass instance wouldn't be a valid superClass instance.

You may be able to do what you want, however. Your superClass's property setter could call a normal instance method that subClass could overload. See the trustedSubclassSetterHelper methods in the attached superClass495080 and subClass495080. That helper doesn't actually set the property (otherwise you get into a loop) but merely provides the updated value. This means that the value would have to be something both superClass495080 (in set.prop1) and subClass495080 (in trustedSubclassSetterHelper) accept as a valid value.

>> Q = superClass495080
Q = 
  superClass495080 with properties:
    prop1: 'Hello!'
    prop2: 'My name is'
>> Q2 = subClass495080
Q2 = 
  subClass495080 with properties:
    prop3: 'Dom.'
    prop1: 'Hello World!'
    prop2: 'My name is'

MATLAB: How can we compered every element in array with input element entered by user and retrieve the biggest number

This is essentially the same homework question as discussed here: http://www.mathworks.com/matlabcentral/answers/315165-i-got-a-task-from-my-group-studying-class-the-question-is-quite-confusing-and-i-m-new-to-matlab-he

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MATLAB: How can we compered every element in array with input element entered by user and retrieve the biggest number

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