Class Property: Array of Objects (2024)

Yes! You all are right!

In my case, I will not use a "dependent property" because I want to access the values stored in the memory.

I think that I'm understanding...

Just to be clear:

Question A: What are: "n" and "value" variables in the Guilleaume code?

Question B: I want add some "properties" inside the prop variable. Like a "struct" or "object" inside the prop propertie.

Example:

Please, how can I do that?

Is there a way to define the properties inside the prop? Like a class, I could define the name and type of all properties inside prop. Is this possible?

Thank you so much!

I think the 1:n in Guillaume's code is a typo and should be 1:number instead. The other n's are just place-holder variables in an arrayfun expression, for each of the 1:number values in succession.

'prop' will be an array of classes so yes you can set properties on them. If you are wanting to make lots of changes then having them embedded inside another class is not necessarily the best option, but it depends on the situation really.

Adam, you said that "prop will be an array of classes"...

So, I need to create a new M file and create a new class?

Could you please write a little example?

Well, my comment was a little inaccurate - it will be an array of class objects to be more accurate.

You told us in the original question though that you already have this class, it is called 'sub_class' so prop will be an array of objects of this type, whatever is in that class.

Thank you Adam for your quick response!

I will try this solution and I will give a feedback as soon as possible!

Thank you all!

Yes, as Adam pointed out there were a few typos in my example (now corrected). In addition, I'd forgotten that arrayfun cannot create arrays of object, so I've changed the implementation to an explicit loop.

prop can be anything you want, array of class objects (whose class you define in a separate m file, a structure array (in which case you don't need another file), or something else.

Note that I've ignored methods and properties attributes in my example. I assumed that prop would be read-only. If prop is read/write as your

would require (assumin that sub_class is a value class), then the user can also change the size of the prop array independently of the number property, breaking your class. If you want to avoid that, you'd also need a property setter for prop, e.g:

Hi Andrew, thanks for your response.

But I'm newer in MATLAB OOP, and I did not understand how your code will return a array of objects of "sub_class()" inside the "dependent property" prop.

Could you explain better for a young MATLAB programmer? Obs.: My doubt is not the get/set idea. Im a C++ programmer.

Thank you!

If sub_class is actually a subclass of main_class, it inherits the properties and methods of main_class. That would include the property number and the method get.prop. So if you type

get.prop will create a sub_class object and return it as main.prop. Then, in main.prop, get.prop will create yet another sub_class object and return it as main.prop.prop. I agree with Adam and Guillaume - this is not the way to go!