Creation of app components with a loop (AppDesigner)

Hello!! I am a student and I am trying to find a way to create a good amount of lamps in my app through a 'for' loop when I press a button, where the limiting numbers are known. However, I keep having an error that says "Unrecognized property 'lampx' for class 'app1'". The code I am using is:

 % Button pushed function: AplicarButton_2
function AplicarButton_2Pushed(app, event)
    val_col = 80;
    
    for i = 1:app.NfilasEditField.Value                 %   Known number of rows
        val_fila = 20;
        for j = 1:app.NcolumnasEditField.Value          %   Known number of columns
            num = i + j;
            str = "lamp" + string(num);
            
            %   Creation of lamps (positions)
            app.(str) = uilamp(app.UIFigure);
            app.(str).Position = [val_col val_fila 18 18];

            val_col = val_col + 30;
        end
        val_fila = val_fila + 30;
        val_col = 80;
    end
end

That's why I ask for an answer so I can finish my task. Thank you

Answer 1

[Simon Chan]

Try to modify

 %   Creation of lamps (positions)
            app.(str) = uilamp(app.UIFigure);
            app.(str).Position = [val_col val_fila 18 18];

to the following:

 %   Creation of lamps (positions)
            app.Nlamp(num) = uilamp(app.UIFigure);
            app.Nlamp(num).Position = [val_col val_fila 18 18];

[Caio Lorenzo Iriarte Salles]

Hello!!

It still gives me an error, saying: "Unrecognized method, property, or field 'Nlamp' for class 'app1'". But thank you for the help!

[Simon Chan]

Please find the attached file for your reference.

It should be modified as following:

% Button pushed function: Button
function AplicarButton_2Pushed(app, event)
    val_col = 80;                                   % Move to here for starting value
    val_fila = 20;                                  % Move to here for starting value
    for i = 1:app.NfilasEditField.Value             % Known number of rows, which is 3 in the attached file       
        for j = 1:app.NcolumnasEditField.Value      % Known number of columns, which is 5 in the attached file
            num = i + j;         
            %   Creation of lamps (positions)
            app1.Nlamp(num) = uilamp(app.UIFigure);
            app1.Nlamp(num).Position = [val_col val_fila 18 18];
            val_col = val_col + 30;
        end
        val_fila = val_fila + 30;
        val_col = 80;
    end
end

[Caio Lorenzo Iriarte Salles]

Okay, now the lamps are created!! Might I ask you how could I refer to each lamp following your script, so I can for example make one lamp invisible? Thank you

[Simon Chan]

If you would like to make lamp #4 invisible, try the following.

set(app1.Nlamp(4),'Visible','off')

[Caio Lorenzo Iriarte Salles]

Thank you!