Variable size class properties for C++ code export

Dear all,

I would like to use a class as input to a function that is later exported to C++-code.

Something like:

classdef inputClass
    properties
        var(:, 1)
        b = 0
    end
end

Here var(:, 1) means, that I want var to be of variable size. However, as soon as I use var the coder complains about mismatching sizes, stating that var is of size 0x1. Can I somehow declare a class property to be of variable size? According to the page here, coder.varsize does not work.

Thanks in advance

Torsten

[Guillaume]

I don't know much about coder (don't have the toolbox), but reading the page you link, I'm not sure that you can have variable size class properties. However, that page is really lacking in details.

In any case, you certainly don't have to specify the (:, 1) since I doubt that coder generates the required property validation code anyway.

[winkmal]

Which Matlab version are you on? I don't have Coder either, but this reminds me very much of a problem I had some time ago, which turned out to be a bug! This was in R2017b, so it should be fixed by now. Read here for details.

[Viet Nguyen]

Did you end up getting this resolved? I am running into the same error.

Answer 1

[Sayyed Ahmad]

The defination of var is wrong.

it's ok if you write

classdef inputClass
    properties
        var;
        b = 0
    end
    methods
       function o = inputClass(varargin)
            if nargin == 2
                o.var = varargin{1};
                o.b= varargin{2};
            else 
                error("the nuber of arguments do not match!")
            end
        end 
    end 
end

>>x=inputClass([1 2 3],2)

x = 

  inputClass with properties:

    var: [1 2 3]
      b: 2

[Guillaume]

"The defination of var is wrong."

From a pure matlab point of view (ignoring coder), there is nothing wrong with the definition of var. Can you explain what you mean by that?

[Sayyed Ahmad]

you can def. a variable without dimension or a fix dimension. But a def. like var(:,1) could not be handel by compeiler.

Compeiler could be handel a calling of variable by var(:,1) but not the def. of variable.