Change selected item in ListBox

Hey,

I have to create a GUI to process EEG Data. The data has already been semi processed by me. When the app is opened, I load 3 different workspaces into a ListBox with the 'load Data' Button. When I choose "Paradigma 1" from the ListBox, I can then plot a single channel or more. So far, that works. Unfortunately I can't change the paradigm from the list box without closing the app and starting it again. I use the button "neues Paradigma" to at least clear the UIAxes. But I'd like to add code to the Button Function to be able to change the workspace I'm working with without having to reopen the app.

This is how I load the Data and assign it to the items in the List:

% Callbacks that handle component events
    methods (Access = private)

        % Button pushed function: loadDataButton
        function loadDataButtonPushed(app, event)
            app.ws1 = load('App/app_p1.mat');
            app.zeit = app.ws1.eeg_1;
            app.t = app.ws1.t_1;
            app.freq = app.ws1.EEG_1;
            app.f = app.ws1.f_1;
            app.F = app.ws1.F;

            app.ws2 = load('App/app_p2.mat');
            app.zeit = app.ws2.eeg_2;
            app.t = app.ws2.t_2;
            app.freq = app.ws2.EEG_2;
            app.f = app.ws2.f_2;
            app.F = app.ws2.F;

            app.ws3 = load('App/app_p3.mat');
            app.zeit = app.ws3.eeg_3;
            app.t = app.ws3.t_3;
            app.freq = app.ws3.EEG_3;
            app.f = app.ws3.f_3;
            app.F = app.ws3.F;

            
        end

        % Value changed function: ParadigmaAuswahlListBox
        function ParadigmaAuswahlListBoxValueChanged(app, event)
            
            value = app.ParadigmaAuswahlListBox.Value;
            
            switch value
            case 'Paradigma 1'
            app.ws1;
            case 'Paradigma 2'
            app.ws2;
            case 'Paradigma 3'
            app.ws3;
            end

            
        end
        

[Mario Malic]

This should work, however, you could simplify your code a lot if you use ws instead of ws1, ws2, ws3.

function ParadigmaAuswahlListBoxValueChanged(app, event)
    
    value = app.ParadigmaAuswahlListBox.Value;
    
    switch value
    case 'Paradigma 1'
        app.ws1 = load('App/app_p1.mat');
        % rest of the code
    case 'Paradigma 2'
        app.ws2 = load('App/app_p2.mat');
        % rest of the code like in Paradigma 3
    case 'Paradigma 3'
        app.ws3 = load('App/app_p3.mat');
        app.zeit = app.ws3.eeg_3;
        app.t = app.ws3.t_3;
        app.freq = app.ws3.EEG_3;
        app.f = app.ws3.f_3;
        app.F = app.ws3.F;
    end
    
end

[Mina Westphal]

Thank you! That worked.

Answer 1

[VBBV]

Assign value as output argument to function ParadigmaAuswahlListBoxValue as shown below, and pass it as input argument to function loadDataButtonPushed , then use the switch-case code to load data and/or plot inside that function

% Callbacks that handle component events
    methods (Access = private)

        % Button pushed function: loadDataButton
        function loadDataButtonPushed(app, event,value)
        
            switch value
                case strcmp(value,'Paradigma 1')
                    app.ws1 = load('App/app_p1.mat');
                    app.zeit = app.ws1.eeg_1;
                    app.t = app.ws1.t_1;
                    app.freq = app.ws1.EEG_1;
                    app.f = app.ws1.f_1;
                    app.F = app.ws1.F;
                   
                case strcmp(value,'Paradigma 2')
                    app.ws2 = load('App/app_p2.mat');
                    app.zeit = app.ws2.eeg_2;
                    app.t = app.ws2.t_2;
                    app.freq = app.ws2.EEG_2;
                    app.f = app.ws2.f_2;
                    app.F = app.ws2.F;
                
                case strcmp(value,'Paradigma 3')
                    app.ws3 = load('App/app_p3.mat');
                    app.zeit = app.ws3.eeg_3;
                    app.t = app.ws3.t_3;
                    app.freq = app.ws3.EEG_3;
                    app.f = app.ws3.f_3;
                    app.F = app.ws3.F;

            end                   
            
        end

        % Value changed function: ParadigmaAuswahlListBox
        function value = ParadigmaAuswahlListBoxValueChanged(app, event)
            
            value = event.Value;            
            app.ParadigmaAuswahlListBox.Value =  value; 

            
        end
        

[Mina Westphal]

Thank you!