MATLAB: Find path of app when opening app using ‘Open’ menu from a different directory (App designer)

app designer

Dear All,

I need to save the output of an app to its folder, so I need to find out the app path when opening the app. This is easy, with pwd, when opening it by double click. However, if I open the app via Open menu in matlab, from a different directory, how to I find out the app path when opening it? (wanted to place this command in the startupFcn(app) function.

Please advise,

Best Answer

mfilename('fullpath')

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MATLAB: How to make an image file path relative to an mlapp file that uses it

When given a relative file path, MATLAB will search the current directory and then the MATLAB path. When the current directory is a folder containing both the .mlapp file and an image file, 'icon.png', calling "uiimage(app.UIFigure, 'ImageSource', 'icon.png');" finds the image, but if the current MATLAB directory is different from that folder then it won't be found unless it is on the MATLAB path. The absolute file path can be hard coded, but this makes the app difficult to share between users. Commands like "pwd" also return the path to the current MATLAB directory, and not the path to the directory of the script that called it.

To obtain the absolute path to the image at run time, the following lines can be added to "startupFcn" in the .mlapp file:

imageFile = 'icon.png';
absPath = fileparts(mfilename('fullpath')); % absolute path to the folder containing the mlapp file
imageAbsolute = fullfile(absPath, imageFile); % absolute path to the image file
uiimage(app.UIFigure, 'ImageSource', imageAbsolute);

MATLAB: Problem with sliders and plot (App Designer)

I think this is what you mean but let me know if I’m wrong.

     % Callbacks that handle component events
    methods (Access = private)
    % Value changing function: alfaSlider
        function alfaSliderValueChanging(app, event)
            x = 0:0.01:100;
            y = app.alfaSlider.Value*x + app.betaSlider.Value;
            plot(app.UIAxes,x,y)
        end
        % Value changing function: betaSlider
        function betaSliderValueChanging(app, event)
           x = 0:0.01:100;
           y = app.betaSlider.Value + app.alfaSlider.Value*x;
           plot(app.UIAxes,x,y)
        end

You could make this shorter by just having one callback written for both of them (they do the same thing), but that’s not super important for something with a few lines of code.

Best Answer

Related Solutions

MATLAB: How to make an image file path relative to an mlapp file that uses it

MATLAB: Problem with sliders and plot (App Designer)

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