the app I created in MATLAB App designer is not responding, it worked before but now it has stopped responding, even I can't close the desktop window

I was working on the app in app designer to record audio,add noise, and then filter the noise with suitable filter, for this I also plotted the time domain and frequency domain spectrum of each signal , i also have difficulting in plotting the filtered signal spectrums, like when I added the code to plot the filtered signal , I started encountering the problem, the app in not running.even I can't close the window! my matlab version is R2018a.

here is my code

classdef app1 < matlab.apps.AppBase
    
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure                  matlab.ui.Figure
        RecordButton              matlab.ui.control.Button
        durationTextAreaLabel     matlab.ui.control.Label
        durationTextArea          matlab.ui.control.TextArea
        playButton                matlab.ui.control.Button
        UIAxes                    matlab.ui.control.UIAxes
        UIAxes2                   matlab.ui.control.UIAxes
        wanttoaddnoiseCheckBox    matlab.ui.control.CheckBox
        ButtonGroup               matlab.ui.container.ButtonGroup
        noiseaddedButton          matlab.ui.control.RadioButton
        playnoisysignalButton     matlab.ui.control.Button
        SNRTextAreaLabel          matlab.ui.control.Label
        SNRTextArea               matlab.ui.control.TextArea
        UIAxes3                   matlab.ui.control.UIAxes
        UIAxes4                   matlab.ui.control.UIAxes
        filterButton              matlab.ui.control.Button
        UIAxes5                   matlab.ui.control.UIAxes
        UIAxes6                   matlab.ui.control.UIAxes
        showfilteredsignalButton  matlab.ui.control.Button
    end
    
    
    properties (Access = private)
        
        % Description
        SNR % Description
        play % Description
        filteredData % Description
        Property4 % Description
        Property5 % Description
    end
    
    methods (Access = private)
        
        function results = func(app)
            
        end
        
    end
    
    
    methods (Access = private)
        
        % Button pushed function: RecordButton
        function RecordButtonPushed(app, event)
            audioObject= audiorecorder(44100,16,1);
            Duration=str2double(app.durationTextArea.Value{1});
            msgbox('recording start');
            recordblocking(audioObject,Duration);
            msgbox('recording stopped');
            assignin('base','audioObject',audioObject);
        end
        
        % Button pushed function: playButton
        function playButtonPushed(app, event)
            audioObject=evalin('base','audioObject');
            audioData=getaudiodata(audioObject);
            sound(audioData,audioObject.SampleRate);
            
            audiowrite('input_audio.wav',audioData,44100);
            % plotting the audio signal in time domain
            t=(0:length(audioData)-1)/44100;
            plot(app.UIAxes,t,audioData);
            
            %plotting the amplitude spectrum of audio signal
            f_InputData = linspace(-44100/2,44100/2,length(audioData));
            INPUTDATA = fft(audioData);
            INPUTDATA_f = fftshift(INPUTDATA);
            INPUTDATA_f_abs = abs( INPUTDATA_f);
            plot(app.UIAxes2,f_InputData,INPUTDATA_f_abs);
            
            
            
        end
        
        % Value changed function: wanttoaddnoiseCheckBox
        function wanttoaddnoiseCheckBoxValueChanged(app, event)
            value = app.wanttoaddnoiseCheckBox.Value;
            
            switch value
                case 0
                    app.noiseaddedButton.Visible = 'off';
                case 1
                    app.noiseaddedButton.Visible = 'on';
            end        
        end
        
        % Button pushed function: playnoisysignalButton
        function playnoisysignalButtonPushed(app, event)
            audioObject = evalin('base','audioObject');
            app.SNR= str2double(app.SNRTextArea.Value{1});
            noisyData=awgn(getaudiodata(audioObject),app.SNR,'measured');
            switch app.wanttoaddnoiseCheckBox.Value
                case 1
                    if(app.noiseaddedButton.Value)
                        app.play = audioplayer(noisyData,44100);
                        playblocking(app.play);
                        assignin('base','noisyData',noisyData);
                        %plotting the noisy signal in time domain
                        audiowrite('noisy_input_audio.wav', noisyData, 44100);
                        t=(0:length(noisyData)-1)/44100;
                        plot(app.UIAxes3,t,noisyData);
                        % plotting amplitude density spectrum of noisy signal
                        f_InputData = linspace(-44100/2,44100/2,length(noisyData));
                        INPUTDATA=fft(noisyData);
                        INPUTDATA_f = fftshift(INPUTDATA);
                        INPUTDATA_f_abs = abs(INPUTDATA_f);
                        plot(app.UIAxes4,f_InputData,INPUTDATA_f_abs);
                        
                        
                    end
                case 0   
                    
                    msgbox('noise not added')
            end
            
            
            
            
        end
        
        % Button pushed function: filterButton
        function filterButtonPushed(app, event)
            fc = 4000; % Cut-off frequency in Hz
            order = 30; % Filter order
            
            % Design the low-pass filter
            [b, a] = butter(order, fc/(44100/2), 'low');
            
            % Apply the filter to the noisy audio signal
            noisyData = evalin('base','noisyData');
            v_filtered = filter(b, a,noisyData);
            
            % Play the filtered audio
            app.filteredData = audioplayer(v_filtered, 44100);
            playblocking(app.filteredData);
            assignin('base','v_filtered',v_filtered);
            v_filtered = evalin('base','v_filtered');
            
            
            
            
            
            
            
            
        end
        
        % Button pushed function: showfilteredsignalButton
        function showfilteredsignalButtonPushed(app, event)
            v_filtered = evalin('base','v_filtered');
            audiowrite('filtered_audio.wav',v_filtered, 44100);
            t_filt= (0:length(app.filteredData)-1)/44100;
            plot(app.UIAxes5,t_filt,v_filtered);
        end
    end
    
    % App initialization and construction
    methods (Access = private)
        
        % Create UIFigure and components
        function createComponents(app)
            
            % Create UIFigure
            app.UIFigure = uifigure;
            app.UIFigure.Position = [100 100 1523 509];
            app.UIFigure.Name = 'UI Figure';
            
            % Create RecordButton
            app.RecordButton = uibutton(app.UIFigure, 'push');
            app.RecordButton.ButtonPushedFcn = createCallbackFcn(app, @RecordButtonPushed, true);
            app.RecordButton.Position = [39 440 100 22];
            app.RecordButton.Text = 'Record';
            
            % Create durationTextAreaLabel
            app.durationTextAreaLabel = uilabel(app.UIFigure);
            app.durationTextAreaLabel.HorizontalAlignment = 'right';
            app.durationTextAreaLabel.Position = [39 406 49 22];
            app.durationTextAreaLabel.Text = 'duration';
            
            % Create durationTextArea
            app.durationTextArea = uitextarea(app.UIFigure);
            app.durationTextArea.HorizontalAlignment = 'right';
            app.durationTextArea.Position = [103 404 139 26];
            app.durationTextArea.Value = {'10'};
            
            % Create playButton
            app.playButton = uibutton(app.UIFigure, 'push');
            app.playButton.ButtonPushedFcn = createCallbackFcn(app, @playButtonPushed, true);
            app.playButton.Position = [39 361 100 22];
            app.playButton.Text = 'play';
            
            % Create UIAxes
            app.UIAxes = uiaxes(app.UIFigure);
            title(app.UIAxes, 'Input Audio Signal')
            xlabel(app.UIAxes, 'time')
            ylabel(app.UIAxes, 'magnitude')
            app.UIAxes.Position = [251 292 444 197];
            
            % Create UIAxes2
            app.UIAxes2 = uiaxes(app.UIFigure);
            title(app.UIAxes2, 'Amplitude Density spectrum of Audio Signal')
            xlabel(app.UIAxes2, 'frequency')
            ylabel(app.UIAxes2, 'magnitude')
            app.UIAxes2.Position = [255 70 436 207];
            
            % Create wanttoaddnoiseCheckBox
            app.wanttoaddnoiseCheckBox = uicheckbox(app.UIFigure);
            app.wanttoaddnoiseCheckBox.ValueChangedFcn = createCallbackFcn(app, @wanttoaddnoiseCheckBoxValueChanged, true);
            app.wanttoaddnoiseCheckBox.Text = 'want to add noise?';
            app.wanttoaddnoiseCheckBox.Position = [75 276 123 22];
            
            % Create ButtonGroup
            app.ButtonGroup = uibuttongroup(app.UIFigure);
            app.ButtonGroup.BorderType = 'none';
            app.ButtonGroup.Position = [64 227 123 30];
            
            % Create noiseaddedButton
            app.noiseaddedButton = uiradiobutton(app.ButtonGroup);
            app.noiseaddedButton.Visible = 'off';
            app.noiseaddedButton.Text = 'noise added';
            app.noiseaddedButton.Position = [11 4 87 22];
            app.noiseaddedButton.Value = true;
            
            % Create playnoisysignalButton
            app.playnoisysignalButton = uibutton(app.UIFigure, 'push');
            app.playnoisysignalButton.ButtonPushedFcn = createCallbackFcn(app, @playnoisysignalButtonPushed, true);
            app.playnoisysignalButton.Position = [89 144 104 22];
            app.playnoisysignalButton.Text = 'play noisy signal';
            
            % Create SNRTextAreaLabel
            app.SNRTextAreaLabel = uilabel(app.UIFigure);
            app.SNRTextAreaLabel.HorizontalAlignment = 'right';
            app.SNRTextAreaLabel.Position = [64 185 31 22];
            app.SNRTextAreaLabel.Text = 'SNR';
            
            % Create SNRTextArea
            app.SNRTextArea = uitextarea(app.UIFigure);
            app.SNRTextArea.HorizontalAlignment = 'right';
            app.SNRTextArea.Position = [110 185 77 24];
            app.SNRTextArea.Value = {'12'};
            
            % Create UIAxes3
            app.UIAxes3 = uiaxes(app.UIFigure);
            title(app.UIAxes3, 'Noisy signal')
            xlabel(app.UIAxes3, 'time')
            ylabel(app.UIAxes3, 'magnitude')
            app.UIAxes3.Position = [726 292 414 197];
            
            % Create UIAxes4
            app.UIAxes4 = uiaxes(app.UIFigure);
            title(app.UIAxes4, 'Amplitude Density spectrum of Noisy Signal')
            xlabel(app.UIAxes4, 'frequecny')
            ylabel(app.UIAxes4, 'magnitude')
            app.UIAxes4.Position = [726 70 414 207];
            
            % Create filterButton
            app.filterButton = uibutton(app.UIFigure, 'push');
            app.filterButton.ButtonPushedFcn = createCallbackFcn(app, @filterButtonPushed, true);
            app.filterButton.Position = [103 70 100 22];
            app.filterButton.Text = 'filter';
            
            % Create UIAxes5
            app.UIAxes5 = uiaxes(app.UIFigure);
            title(app.UIAxes5, 'Title')
            xlabel(app.UIAxes5, 'X')
            ylabel(app.UIAxes5, 'Y')
            app.UIAxes5.Position = [1170 292 382 197];
            
            % Create UIAxes6
            app.UIAxes6 = uiaxes(app.UIFigure);
            title(app.UIAxes6, 'Title')
            xlabel(app.UIAxes6, 'X')
            ylabel(app.UIAxes6, 'Y')
            app.UIAxes6.Position = [1170 70 382 207];
            
            % Create showfilteredsignalButton
            app.showfilteredsignalButton = uibutton(app.UIFigure, 'push');
            app.showfilteredsignalButton.ButtonPushedFcn = createCallbackFcn(app, @showfilteredsignalButtonPushed, true);
            app.showfilteredsignalButton.Position = [94 32 118 22];
            app.showfilteredsignalButton.Text = 'show filtered signal';
        end
    end
    
    methods (Access = public)
        
        % Construct app
        function app = app1
            
            % Create and configure components
            createComponents(app)
            
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            
            if nargout == 0
                clear app
            end
        end
        
        % Code that executes before app deletion
        function delete(app)
            
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

[Voss]

Can you upload the mlapp file, using the paperclip button?

[Nayab]

I don't get, how to upload it using paperclip button

[Nayab]

here is the file

Answer 1

[Sandeep Mishra]

Hi Nayab,

I understand you are encountering an error while running the ‘Show Filtered Signal’ button in the App designer.

I observed that the ‘t_filt’ variable contains a scalar value 0 while the ‘v_filtered’ variable is a vector in the MATLAB ‘plot’ function.

This discrepancy causes the increase in the processing time. For a 10-second audio duration signal, it took 132 seconds to display the filtered signal.

To resolve the error, you can replace the ‘t_filt’ value with a vector of same size as ‘v_filtered’ value on Line #157 of the provided code.

Refer to the below example code snippet which replaces scalar value with a vector value:

t_filt= (0:app.filteredData.TotalSamples-1)/44100;

I hope this will help you resolve the error and successfully plot the filtered signals.