Not able to run the app designer code.

Hi all, i am trying to run app designer program. but could not succeded, it throwing the error always.

today4

Error using today4

Method 'registerApp' in class 'today4' uses different access permissions than its superclass

'matlab.apps.AppBase'. Set 'registerApp' access to 'protected' to match superclass.

The program that i have written is for GUI/APP for live real time plotting of audio signal.

classdef today4 < matlab.apps.AppBase

    % Properties
    properties (Access = private)
        % GUI components
        UIFigure
        LiveAudioAxes
        StartButton
        StopButton
        AudioObj
        
        % Audio parameters
        Fs
        NumChannels
        
        % Live plot variables
        PlotInterval
        PlotTimer
    end

    % App Designer callbacks
    methods (Access = private)

        % Button pushed function: StartButton
        function StartButtonPushed(app, ~)
            % Initialize audio input
            app.AudioObj = audioDeviceReader(app.Fs, app.NumChannels);
            
            % Create a timer for live plotting
            app.PlotTimer = timer('TimerFcn', @(~,~) app.plotLiveData(),...
                'Period', app.PlotInterval,...
                'ExecutionMode', 'fixedRate');
            
            % Start the timer
            start(app.PlotTimer);
        end

        % Button pushed function: StopButton
        function StopButtonPushed(app, ~)
            % Stop the timer
            stop(app.PlotTimer);
            
            % Release the audio device
            release(app.AudioObj);
        end

        % Close request function: UIFigure
        function UIFigureCloseRequest(app, ~)
            % Stop the timer
            stop(app.PlotTimer);
            
            % Delete the timer and release the audio device
            delete(app.PlotTimer);
            release(app.AudioObj);
            
            % Delete the figure
            delete(app);
        end

        % Create UIFigure and components
        function createComponents(app)
            % Create UIFigure
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'Live Audio Plotter';
            app.UIFigure.CloseRequestFcn = createCallbackFcn(app, @UIFigureCloseRequest, true);
            
            % Create LiveAudioAxes
            app.LiveAudioAxes = uiaxes(app.UIFigure);
            title(app.LiveAudioAxes, 'Live Audio Signal')
            xlabel(app.LiveAudioAxes, 'Time')
            ylabel(app.LiveAudioAxes, 'Amplitude')
            app.LiveAudioAxes.Position = [50 100 550 300];
            
            % Create StartButton
            app.StartButton = uibutton(app.UIFigure, 'push');
            app.StartButton.Position = [200 50 100 22];
            app.StartButton.Text = 'Start';
            app.StartButton.ButtonPushedFcn = createCallbackFcn(app, @StartButtonPushed, true);
            
            % Create StopButton
            app.StopButton = uibutton(app.UIFigure, 'push');
            app.StopButton.Position = [320 50 100 22];
            app.StopButton.Text = 'Stop';
            app.StopButton.ButtonPushedFcn = createCallbackFcn(app, @StopButtonPushed, true);
        end

        % Protected method: Register the app with MATLAB App Designer
        function registerApp(app)
            % Create and configure component properties
            app.UIFigure.Visible = 'on';
            app.UIFigure.Position = [100 100 640 480];
        end

    end

    % Methods
    methods (Access = protected)
        
        % Plot live data
        function plotLiveData(app)
            % Read audio data
            audioData = app.AudioObj();
            
            % Plot audio signal
            plot(app.LiveAudioAxes, audioData);
            app.LiveAudioAxes.YLim = [-1 1];
            drawnow;
        end
        
    end
    
    % App creation and deletion
    methods (Access = public)

        % Construct app
        function app = today4(Fs, numChannels, plotInterval)
            % Set audio parameters
            app.Fs = Fs;
            app.NumChannels = numChannels;
            
            % Set plot interval
            app.PlotInterval = plotInterval;

            % Create and configure components
            createComponents(app)

            % Register the app with App Designer
            app.registerApp();
            
            if nargout == 0
                clear app
            end
        end

        % Code to display the app
        function run(app)
            if ~isdeployed
                % Run the app
                app.UIFigure.Visible = 'on';
            end
        end
    end
end

[Image Analyst]

If you have any more questions, then attach your .mlapp file and any data needed to read it in with the paperclip icon after you read this:

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[Kulbir]

@Image Analyst

hello sir, thank you for the information. kindly find the attached file.

i am not able to run it. it's .m file. am trying to run it in the editor.

Answer 1

[Kautuk Raj]

The error you are encountering is because the registerApp method in your today4 class has different access permissions than the superclass matlab.apps.AppBase. The access permission of the registerApp method in the superclass is protected, so you need to match that in your subclass.

To fix the error, change the access permission of the registerApp method to protected.

Further, move the registerApp method inside the methods (Access = protected) block.