MATLAB: Call a function in an m-file from a method of a handle class

classhandlesMATLAB

I would like to know, if the object, which is being created with the help of the (handle) class methods, would also be visible for modifications in a function called from a method of the (handle) class, even if I don't pass the object itself to that function?

If the object is visible to the function called in a class method, so I can just work with it from the function using it's name from the class itself (using the name of the "constructor function")?

Or must I pass the object to the function called in the class method?…

Thank you for your answer in advance!

Best Answer

A method operating on objects of a class must have the object as its first input in matlab. (In other languages, e.g C++, this first parameter is automatically added by the compiler).

However, you can separate the methods of a class into different files. See this page for the details. Basically, create a folder named @yourclassname, populate this folder with at least yourclassname.m which can just contain the class definition. You can implement the methods either in yourclassname.m or in separate files in the same @ folder. Either way, the first input of the method must be the class object.

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MATLAB: Matlab M-File

You should review the documentation on how to write a function, since your above code is not a correctly written function. First, come up with a name for your function, e.g. myFunction. Then create a new file called myFunction.m somewhere on the MATLAB path (e.g. your working directory). Then in that file put your code. E.g.,

function result = myFunction(V)
result = V;  % <-- allocate the result variable, copying all elements
%

% Insert your code here to create the result variable from the V variable
%
return
end

I will give you some hints about correcting your code:

Change this loop:

for i=1:1:6;  % <-- hard coded for exactly 6 elements

to this

for i=1:numel(V)  % <-- allows any size input

The following test has an error in the logic (compare this carefully with the requirement):

if [V(i)<0 | mod(V(i),2)==0 | mod(V(i),4)==0]

The following line has an error on the right hand side calculation (compare this carefully with the requirement):

    V(i)=i*i;

If you don't see what the errors are, step through a small example by hand and compare that to the code result. E.g., at the command line type this:

V=[10,4,7,-8,-3,-12];
myFunction(V)

MATLAB: Super class get callers name

Found it. Just call this:

 me = class(obj);

this gives the name of the created subclass. I call it in the constructor of the superclass:

 function obj = mySuperClass() %constructor
   me = class(obj);
   obj.name = me;
 end

Best Answer

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MATLAB: Matlab M-File

MATLAB: Super class get callers name

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