write MATLAB class in separate files

Question

It's nothing new to ask such question. Since I've spent some hours reading on the documentation and available examples. But awkwardly, MATLAB seems not accept my code. So, I feel totally confused

classdef testclass

    %UNTITLED Summary of this class goes here
    %   Detailed explanation goes here

    properties
        a =3;
        b =4;
    end

    methods

        function obj = testclass(a_inp, b_inp) % 
            obj.a = a_inp;
            obj.b = b_inp;
        end

        output = plus(obj)

        output = minus(obj)
    end

end

and the function

function output = minus(obj)

output = obj.a-obj.b;
end

I think this is a typical test. But when I initialize the class, it comes this error

Error using testclass
Too many input arguments.

Error in class_call (line 2)
myclass = testclass(3,4    );

I create the class by myclass = testclass(3,4 );

what might be wrong in my code? plz help! I'm stuck!

AFAIK I know, MATLAB has no concept of partial classes that can be spread across multiple m files. You'll have to define those methods in the same file, within the class definition. — Praetorian
Are you looking for this? @Praetorian isn't correct. Either you define everything in one big file or you define everything based on the @MyClass folder scheme. The lines output = plus(obj) and output = minus(obj) in your classdef make no sense. — horchler
@horchler Thanks! It's been a while since I've looked at the OOP stuff in MATLAB and clearly I have some catching up to do. — Praetorian
thank you for your common interests in MATLAB OOP! @horchler: that's the signatures of the functions contained in separate files and it's mentioned in section "Specifying Method Attributes in classdef File" in your link — TSL_
What is class_call? And why are there extra spaces after your 4? are you changing what the real inputs are? I can't replicate this. Can you call obj = testclass(3,4) from the command window? Also, there's no need to include function signatures if you're not specifying any method attributes like Static or Access=private (I suppose it doesn't hurt but it looks weird). — horchler

Navan Navan · Accepted Answer · 2014-01-22T18:01:47

The code you have is correct. As @ horchler says only thing you need is to put all your files including class definition inside @testclass directory. Without this directory you cannot have separate files for a class.

The code you tried for instantiating the class also should work fine outside @testclass directory. You would get error only when calling the method plus or minus if you have not placed your files in @testclass directory.

write MATLAB class in separate files

1 Answers