MATLAB: Can’t call function within class

functions

Hi everyone. First time posting here. I have a matlab class of a signal which comprises parts x, y, sampling rate (Fs), and Color. I have also defined a function within the methods of the class for resampling the signal and building a new x axis for the resampled data. However, I'm unable to call this function even after creating an object.

Using R2019b. The code is as follows:

classdef sigmoid_signal
    properties
        signal_x
        signal_y
        Fs
        Color
    end
    
    methods 
        function resamp_x,resamp_y = resamp_sig(obj);
            resamp_x = 1/obj.Fs:1/obj.Fs:numel([obj.signal_y])/obj.Fs;
            resamp_y = abs(resample([obj.signal_y],[obj.signal_x],obj.Fs));
         
        end
    end  
end

Best Answer

You forgot to bracket the output args, and the semi-column is useless:

function [resamp_x,resamp_y] = resamp_sig(obj)

Related Solutions

MATLAB: Is calling a superclass constructor after a use of the object not allowed

I can only speculate as to why it would not be allowed, but I assume there are hazards in using an object that is not finished being constructed...like feeding a baby that is only half way through being born, or driving a car that’s only half assembled.

Below is how I would re-implement. In your original design, it doesn't make sense to me that the classB constructor should have to set x if it has already been set in classA.

classdef superclass
    
    %% PROPERTIES
    properties 
        x;
        y;
    end
    
end

classdef classA < superclass
    
    %% PROPERTIES
    properties
        a
    end
    
    properties (Access=private)
        z
    end
    
    %% METHODS
    methods
        % Constructor


        function obj = classA(a,z,y)
            obj.x = a*z;
            obj.a = a;
            obj.z = z;
            if nargin>2
             obj.y=y;   
            end
        end
    end
    
end

classdef classB < superclass
    
    %% PROPERTIES
    properties
        b
    end
    properties (Access=private)
        z
    end
    
    %% METHODS
    methods
        % Constructor
        function obj = classB(b,z,x)
            obj.y = z+b;
            obj.b = b;
            obj.z = z;
            if nargin>2
               obj.x=x; 
            end
        end
    end
    
end

classdef subclass < classA & classB
    
    %% METHODS
    methods
        % Constructor
        function obj = subclass(a,b,z)
            obj@classA(a,z);  %set x but not y
            obj@classB(b,z);  %set y but not x  
        end
    end
    
end

MATLAB: ??? Error: The expression to the left of the equals sign is not a valid target for an assignment.

Hi,

your else if (in C code) conditions are badly written -> elseif in matlab code.

and the conditions are not conditions. you need to use == instead of =.

something like

if obj==L;
    [y,fs]=wavread('tl.wav');
    player=audioplayer(y,fs);
    play(player)
elseif  obj==R;
    [y,fs]=wavread('tr.wav');
    player=audioplayer(y,fs);
    play(player)
elseif obj==F;
    [y,fs]=wavread('mf.wav');
    player=audioplayer(y,fs);
    play(player)
elseif obj==B;
    [y,fs]=wavread('mb.wav');
    player=audioplayer(y,fs);
    play(player)
else
    [y,fs]=wavread('s.wav');
    player=audioplayer(y,fs);
    play(player)
end

Best Answer

Related Solutions

MATLAB: Is calling a superclass constructor after a use of the object not allowed

MATLAB: ??? Error: The expression to the left of the equals sign is not a valid target for an assignment.

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