Trying to load .mat file into App Designer and then graph it

I am having a hard time trying to load a .mat file into the workspace and then have it graphed. In the simple app I've designed I have a push button and an axes. This is the code I have for the push button thus far. The button successfully opens a window in which I can choose a file but I can't get that file to load into the axes. What am I missing in my code?

The error that comes up is on the 'load('.mat') line and reads: Error using load Unable to read file '.mat'. No such file or directory.

Do I need to add the file I've opened to my directory? How would I do that?

Thank you so much.

% Button pushed function: MagicButton

function MagicButtonPushed(app, event)

uigetfile('.mat','Select a File')

load('.mat')

plot(app.UIAxes,[1;],'.mat')

app.UIAxes.YLim= [-1000 1000]

end

Answer 1

[Kojiro Saito]

You need to set file path from uigetfile then load it.

[file,path] = uigetfile('*.mat', 'Select a File');
if isequal(file,0)
    disp('User selected Cancel')
else
    load(fullfile(path,file))
    plot(app.UIAxes,[1;], XXX); % XXX is variable contains in you mat file
    app.UIAxes.YLim= [-1000 1000]
end

[Emma Peek]

Thank you so much!