Debugger running different code than normal runner

Hello, I've been using app designer to try and create a UI for some analysis that we're currently doing. When I try to change the axes/plot positions, it works when I run it using debug mode, but it does not work when I run it normally.

I was able to recreate it with a simple test case.

Adding two axes in a simple grid layout (image 1) with the following code (image 2):

            app.UIAxes.Position = [100 150 200 300];
            app.UIAxes2.Position = [300 350 400 500];

If I were to put a breakpoint on the first line, press run and then continue, the results are what is expected with the graphs out of place (image 3). However, if I were to run it without any breakpoints, the runner treats it as if the code wasn't there (image 4). I was wondering if someone could help me get it to work normally, without having to use breakpoints to work around this bug.

Image 1

image 2

image 3

image 4

Answer 1

[Walter Roberson]

Add a drawnow() ?

[Steven Lord]

That was my first thought as well. The reason that your code running in debug mode may not need a drawnow is, I believe, related to the More About section on the documentation page for the drawnow function.

"These actions are equivalent to calling a full drawnow command:

• Returning to the MATLAB® prompt.
• Using the getframe, pause, and waitfor functions.
• Using functions that wait for user input, such as waitforbuttonpress, input, keyboard, or ginput."

I believe reaching the debug prompt K>> counts as the first bullet.

[Walter Roberson]

Technically, debugger counts as using keyboard() , which is why the prompt is K>>

[Mingda He]

Hello, I tried adding the drawnow() function, as well as adding these lines to a separate function thats called at the end of every callback, but it still doesn't work. Is there another function that might work?

            app.graphSSWT.Position = [66 284 524 238];
            app.graphWaves.Position = [150 280 524 500];
            drawnow();

Thanks for the help!

[Walter Roberson]

please post the code for testing... my version of MATLAB cannot execute pictures of code.

[Mingda He]

classdef test < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure    matlab.ui.Figure
        GridLayout  matlab.ui.container.GridLayout
        UIAxes2     matlab.ui.control.UIAxes
        UIAxes      matlab.ui.control.UIAxes
    end

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

        % Code that executes after component creation
        function startupFcn(app)
            app.UIAxes.Position = [100 150 200 300];
            app.UIAxes2.Position = [300 350 400 500];
        end
    end

    % Component initialization
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'MATLAB App';

            % Create GridLayout
            app.GridLayout = uigridlayout(app.UIFigure);
            app.GridLayout.ColumnWidth = {'1x'};

            % Create UIAxes
            app.UIAxes = uiaxes(app.GridLayout);
            title(app.UIAxes, 'Title')
            xlabel(app.UIAxes, 'X')
            ylabel(app.UIAxes, 'Y')
            zlabel(app.UIAxes, 'Z')
            app.UIAxes.Layout.Row = 1;
            app.UIAxes.Layout.Column = 1;

            % Create UIAxes2
            app.UIAxes2 = uiaxes(app.GridLayout);
            title(app.UIAxes2, 'Title')
            xlabel(app.UIAxes2, 'X')
            ylabel(app.UIAxes2, 'Y')
            zlabel(app.UIAxes2, 'Z')
            app.UIAxes2.Layout.Row = 2;
            app.UIAxes2.Layout.Column = 1;

            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end

    % App creation and deletion
    methods (Access = public)

        % Construct app
        function app = test

            % Create UIFigure and components
            createComponents(app)

            % Register the app with App Designer
            registerApp(app, app.UIFigure)

            % Execute the startup function
            runStartupFcn(app, @startupFcn)

            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