MATLAB: Display necessary function arguments

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Hello Everybody,

I have been using MATLAB for a while now and I'm continuously encountering the same problem:

When I start typing function arguments, e.g.:

    surf(X,Y,

the editor suggests more necessary function arguments in a yellow box. As soon as i go back to different parts of my code, the box vanishes and does not reappear, when I continue to edit the function arguments. In Pycharm, there is a Hotkey (Ctrl+P) to show the box after going back to the function arguments. Is there something equivalent in MATLAB?

Best Answer

In MATLAB live editor, you can press TAB key to make the list of arguments reappear after disappearing.

Edit: For regular script and command window you can use Ctrl + F1 to force the argument list to appear. If this shortcut is not already defined the go to Preferences > keyboard > shortcuts and search for function hint and set a shortcut key combination

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04/07/2020: Implement Basic Key Press Functionality

I found out what to do based on Mohammad Sami's reply to my question.

(1) Go to callbacks in the app designer window for the entire UIFigure in deisgn view

(2) In the 'keyboard' menu, go to KeyPressFcn and select <add KeyPressFcn callback> (should be at the top of the list). This will create a callback in code view for you to edit.

(3) In the callback, there will be a preset variable called 'key'. Set up a swtich/case for which key's you'd like to perform specific functions. 'key' will always providing the physical key pressed as a string in lowercase letters.

% Key press function: UIFigure

function UIFigureKeyPress(app, event)
key = event.Key;
switch key
    case 'p'
        app.PlotMyData(app);
        app.Message.Value = key; % return key value
    case 'f1'
        app.ChangeData(app);
        app.Message.Value = key;
    case 'shift'
        app.ChangeColor(app);
        app.Message.Value = key;
    case '1'
        app.Message.Value = 'Pressed 1';
end
end

(4) As a side note for those who may not know, you can get a look at what the value of 'key' will be by creating a text box, and setting the value to key (shown above). This will help you designate keys for functions you may have.

Hope this helps someone else as well.

Edit (10/27/2020): Use Modifiers (e.g. shift Q, control P, etc...) along with Key Press

The following code shows an example of how to use modifiers such as 'shift', 'control', and 'alt' with the keypress functionality.

You don't have to use a switch/case and can accomplish the same goal by using if/elseif/else of whatever you'd like. This is just one way I thought of doing this. This allows for things like ctrl+q, shift+p, etc.

Make sure to press them quickly in succession or it will only register one key press, either the modifier or the letter/number/etc. Hope this helps!

% Key press function: UIFigure
function UIFigureKeyPress(app, event)
key = event.Key;
if isequal(event.Modifier,'shift')
    switch key
        case 'f1'
            app.ChangeData(app);
            app.Message.Value = key; 
        case ...
             ...
    end
elseif isequal(event.Modifier,'control')
    switch key
        case 'q'
            app.Message.Value = 'quitting'; % write to text area of GUI
            % insert a quit function % 
        case ...
             ...
    end
else % no modifier used (e.g. just a key press, 'k','f4', etc.)
    ...
end
end

Best Answer

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