MATLAB: Using User-defined class’ object in another user-defined class.

objectuser defined class

Hi, I am really new to matlab, and need help for this. Say I have defined a class Node. The name of the file is then Node.m. I have another class, Element, saved in file Element.m. How do I access the object of class Node in the file Element.m, or any other file for that matter?

Best Answer

There's no reason why you can't call Node's constructor inside Element.m as long as both Node.m and Element.m are visible to MATLAB, e.g., both are on the MATLAB path.

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MATLAB: Overloaded method defined in class definition, not working

I made a classdef-file according to you description. It works as expected (R2013a).

    >> t= cssm_tree
    t = 
      cssm_tree with no properties.
    >> t.find('abc')
    cssm_tree/find
    ans =
        17
    >> help find
      ....
      Overloaded methods:
         tree/find
         mtree/find
         cssm_tree/find
         ...

where

    classdef    cssm_tree < handle
        methods
            function    ix = find( this, f )
                % find is overloaded 
                disp( 'cssm_tree/find' )
                ix = 17;
            end
        end
    end

MATLAB: Can’t I use builtin for classes that overload subsref

I'm guessing a bit, but in MATLAB there are certain precedence rules for choosing which versions of functions can apply to a given list of input arguments. I think BUILTIN can only choose between functions that are of equal precedence (other than w.r.t. position on the path, of course).

In your case, you are calling builtin('subsref',...) with an object, t, of a user-defined class testBuiltIn, as an input argument. Under the precedence rules, user-defined class methods dominate everything but subfunctions, so the only versions of subsref that are of equal precedence are those belonging to the TestBuiltIn class. MATLAB's builtin subsref is not a method of TestBuiltIn, so it is ignored by builtin('subsref',t,s).

It might be worth talking to Tech Support to see if this is intended behavior.

Best Answer

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MATLAB: Overloaded method defined in class definition, not working

MATLAB: Can’t I use builtin for classes that overload subsref

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