How to define size of class property depending on a given parameter (including codegen)

I want to create a class, that is able to handle different property sizes depending on some configuration parameter, which is constant from beginning of the script or at compile time.

For Example, I would like to change the size (513) of the fft in this Class depending on configuration. The solution should work with matlab coder.

classdef FFT_Object

    properties
        FFT = complex(zeros([1 513],'single'),zeros([1 513],'single'));
        
    end
    
    function obj = FFT_Object()
       
    end
    
end

[Matt J]

Why not just leave it undefined?

Answer 1

[Matt J]

With the classdef below, you can set the default size with its defaultSize() static method. This will remain in effect until the script is re-run. E.g.,

FFT_Object.defaultSize(1000);

new_obj=FFT_Object(); %default object of size 1x1000

classdef FFT_Object

 
    properties 
        FFT   
    end
    
    methods
        
        function obj = FFT_Object(inputFFT)
       
           if ~nargin
               
             s=FFT_Object.defaultSize;
           
             obj.FFT = complex(zeros([1 s],'single'),zeros([1 s],'single')); 
             
           else
             obj.FFT=inputFFT;  
           end
             
       end
        
    end
    
    methods (Static)
        
        function varargout=defaultSize(n)
            
            persistent siz
        
            if isempty(siz), siz=513; end
            
            if nargin, siz=n; end
            if nargout, varargout={siz}; end
        end

    end
    
    
    
end