MATLAB: Overload only several functions

MATLABoopoverloadingoverriding

Hi,

I am totally new to Matlab OOP. For my program to work, I need to redefine the built-in min, max and abs functions. However, if I declare these three functions as methods, all the other functions like sine, cosine, etc. must be declared so that they act on the defined object. So how can I only redefine (overload) these three functions and let the others unchanged.

Thanks, Zoli

Best Answer

It sounds like you're trying to implement a numeric class. So I'll refer you to matlab own's documentation on subclassing built-in classes

If you derive from a numeric class (e.g. double), you'll automatically get all the methods that apply to double, and you can override the one you want.

Otherwise, there's no other way than you writing all of them, even if it's just a dispatch to the built-in ones.

Related Solutions

MATLAB: Are .m files in a subfolder of a class folder considered methods of that class

Files in a subfolder of a class folder are not considered methods of the class.

Please refer to the following example:

@myClass > myClass.m:

classdef myClass
    methods
        function classObj = myClass()
            classObj.method1()
            classObj.method2()
        end
    end
end

@myClass > method1.m:

function method1(classObj)
    disp('method in class folder')
end

@myClass > subfolder > method2.m:

function method2(classObj)
    disp('method in subfolder')
end

-----

>> m = myClass
method in class folder

Unrecognized method, property or field 'method2' for class 'myClass'.

Error in myClass (line 5)

classobj.method2()

As you can see, 'method1' is part of the class, but 'method2', which is in a subfolder of '@myClass', is not treated as a method of the class.

For more details about using class folders in MATLAB, please see the following documentation page:

https://www.mathworks.com/help/matlab/matlab_oop/organizing-classes-in-folders.html

MATLAB: Setter method does not work on inherited class

You're using handle syntax to set the property of your class, yet your class is a value class. Either change your setFoo to:

function obj = setFoo(obj, foo)
   obj.foo = foo;
end

and call it with:

test = test.setFoo(10);

or derive from handle:

classdef Foo < matlab.mixin.Heterogeneous & handle

Also, you can create setter and getter for the class properties, using this syntax

function set.foo(obj, value) %for handle class
   obj.foo = value;
end
function obj = set.foo(obj, value) % for value class
   obj.foo = value;
end

which you call simply with:

obj.foo = 10; %for value and handle class.

Best Answer

Related Solutions

MATLAB: Are .m files in a subfolder of a class folder considered methods of that class

MATLAB: Setter method does not work on inherited class

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